Use parameterized tests to test multiple render text implementations.

ui/gfx/render_text_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/render_text.h"
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
 #include <memory>
 
 #include "base/format_macros.h"
 #include "base/i18n/break_iterator.h"
 #include "base/macros.h"
+#include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/core/SkRefCnt.h"
 #include "third_party/skia/include/core/SkSurface.h"
 #include "third_party/skia/include/core/SkTypeface.h"
@@ skipping 28 matching lines @@
 namespace test {
 
 class RenderTextTestApi {
  public:
   RenderTextTestApi(RenderText* render_text) : render_text_(render_text) {}
 
   static SkPaint& GetRendererPaint(internal::SkiaTextRenderer* renderer) {
     return renderer->paint_;
   }
 
-  static internal::TextRunList* GetHarfbuzzRunList(
-      RenderTextHarfBuzz* harfbuzz) {
-    return harfbuzz->GetRunList();
+  // Callers should ensure that the associated RenderText object is a
+  // RenderTextHarfBuzz instance.
+  internal::TextRunList* GetHarfBuzzRunList() {
+    RenderTextHarfBuzz* render_text =
+        static_cast<RenderTextHarfBuzz*>(render_text_);
+    return render_text->GetRunList();
   }
 
   void DrawVisualText(internal::SkiaTextRenderer* renderer) {
     render_text_->EnsureLayout();
     render_text_->DrawVisualText(renderer);
   }
 
  private:
   RenderText* render_text_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderTextTestApi);
 };
 
 }  // namespace test
 
 namespace {
 
+// An enum specifying the different RenderText implementations to be tested.
+enum RenderTextBackend {
+  RENDER_TEXT_HARFBUZZ,
+  RENDER_TEXT_MAC,
+};
+
+// Parameterised test name generator for tests depending on RenderTextBackend.
+struct PrintRenderTextBackend {
+  template <class ParamType>
+  std::string operator()(const testing::TestParamInfo<ParamType>& info) const {
+    switch (info.param) {
+      case RENDER_TEXT_HARFBUZZ:
+        return "HarfBuzz";
+      case RENDER_TEXT_MAC:
+        return "Mac";
+    }
+    NOTREACHED();
+    return std::string();
+  }
+};
+
 // Various weak, LTR, RTL, and Bidi string cases with three characters each.
 const wchar_t kWeak[] =      L" . ";
 const wchar_t kLtr[] =       L"abc";
 const wchar_t kRtl[] =       L"\x5d0\x5d1\x5d2";
 const wchar_t kLtrRtl[] =    L"a" L"\x5d0\x5d1";
 const wchar_t kLtrRtlLtr[] = L"a" L"\x5d1" L"b";
 const wchar_t kRtlLtr[] =    L"\x5d0\x5d1" L"a";
 const wchar_t kRtlLtrRtl[] = L"\x5d0" L"a" L"\x5d1";
 
 // Checks whether |range| contains |index|. This is not the same as calling
@@ skipping 26 matching lines @@
     SCOPED_TRACE(base::StringPrintf(
         "BreakType-%d VisualCursorDirection-%d SelectionBehavior-%d Case-%d.",
         break_type, direction, selection_behavior, static_cast<int>(i)));
 
     render_text->MoveCursor(break_type, direction, selection_behavior);
     EXPECT_EQ(expected->at(i), render_text->selection());
   }
   expected->clear();
 }
 
-// TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
-#if !defined(OS_MACOSX)
 // Ensure cursor movement in the specified |direction| yields |expected| values.
 void RunMoveCursorLeftRightTest(RenderText* render_text,
                                 const std::vector<SelectionModel>& expected,
                                 VisualCursorDirection direction) {
   for (size_t i = 0; i < expected.size(); ++i) {
     SCOPED_TRACE(base::StringPrintf("Going %s; expected value index %d.",
         direction == CURSOR_LEFT ? "left" : "right", static_cast<int>(i)));
     EXPECT_EQ(expected[i], render_text->selection_model());
     render_text->MoveCursor(CHARACTER_BREAK, direction, SELECTION_NONE);
   }
   // Check that cursoring is clamped at the line edge.
   EXPECT_EQ(expected.back(), render_text->selection_model());
   // Check that it is the line edge.
   render_text->MoveCursor(LINE_BREAK, direction, SELECTION_NONE);
   EXPECT_EQ(expected.back(), render_text->selection_model());
 }
-#endif  // !defined(OS_MACOSX)
 
 // The class which records the drawing operations so that the test case can
 // verify where exactly the glyphs are drawn.
 class TestSkiaTextRenderer : public internal::SkiaTextRenderer {
  public:
   struct TextLog {
     TextLog() : glyph_count(0u), color(SK_ColorTRANSPARENT) {}
     PointF origin;
     size_t glyph_count;
     SkColor color;
@@ skipping 96 matching lines @@
 
  private:
   const wchar_t* string_;
   const SkColor* buffer_;
   int stride_;
   int row_count_;
 
   DISALLOW_COPY_AND_ASSIGN(TestRectangleBuffer);
 };
 
-// Helper to run the same test expectations on all RenderText backends.
-class RenderTextAllBackends {
- public:
-  RenderTextAllBackends() : renderer_(&canvas_), current_(nullptr) {}
-
-  bool Advance() {
-    if (!current_) {
-      current_ = &render_text_harfbuzz_;
-      return true;
-    }
-#if defined(OS_MACOSX)
-    if (current_ == &render_text_harfbuzz_) {
-      current_ = &render_text_mac_;
-      return true;
-    }
-#endif
-
-    return false;
-  }
-
-  const char* GetName() const {
-    return current_ == &render_text_harfbuzz_ ? "Harfbuzz" : "Mac";
-  }
-
-  RenderText* operator->() {
-    return current_;
-  }
-
-  void DrawVisualText() {
-    test::RenderTextTestApi test_api(current_);
-    test_api.DrawVisualText(&renderer_);
-  }
-
-  void GetTextLogAndReset(std::vector<TestSkiaTextRenderer::TextLog>* log) {
-    renderer_.GetTextLogAndReset(log);
-  }
-
-  SkPaint& paint() {
-    return test::RenderTextTestApi::GetRendererPaint(&renderer_);
-  }
-
-  internal::TextRunList* GetHarfbuzzRunList() {
-    return test::RenderTextTestApi::GetHarfbuzzRunList(&render_text_harfbuzz_);
-  }
-
- private:
-  Canvas canvas_;
-  TestSkiaTextRenderer renderer_;
-  RenderText* current_;
-
-  RenderTextHarfBuzz render_text_harfbuzz_;
-#if defined(OS_MACOSX)
-  RenderTextMac render_text_mac_;
-#endif
-
-  DISALLOW_COPY_AND_ASSIGN(RenderTextAllBackends);
-};
-
 }  // namespace
 
-class RenderTextTest : public testing::Test {
+// Test fixture class used to run parameterized tests for all RenderText
+// implementations.
+class RenderTextTest : public testing::Test,
+                       public ::testing::WithParamInterface<RenderTextBackend> {
+ public:
+  RenderTextTest()
+      : render_text_(CreateRenderTextInstance()),
+        test_api_(new test::RenderTextTestApi(render_text_.get())),
+        renderer_(canvas()) {}
+
+ protected:
+  std::unique_ptr<RenderText> CreateRenderTextInstance() const {
+    switch (GetParam()) {
+      case RENDER_TEXT_HARFBUZZ:
+        return base::MakeUnique<RenderTextHarfBuzz>();
+
+      case RENDER_TEXT_MAC:
+#if defined(OS_MACOSX)
+        return base::MakeUnique<RenderTextMac>();
+#else
+        break;
+#endif
+    }
+    NOTREACHED();
+    return nullptr;
+  }
+
+  SkPaint& GetRendererPaint() {
+    return test::RenderTextTestApi::GetRendererPaint(renderer());
+  }
+
+  void DrawVisualText() { test_api_->DrawVisualText(renderer()); }
+
+  internal::TextRunList* GetHarfBuzzRunList() {
+    DCHECK_EQ(RENDER_TEXT_HARFBUZZ, GetParam());
+    return test_api_->GetHarfBuzzRunList();
+  }
+
+  void ResetRenderTextInstance() {
+    render_text_ = CreateRenderTextInstance();
+    test_api_.reset(new test::RenderTextTestApi(GetRenderText()));
+  }
+
+  RenderText* GetRenderText() { return render_text_.get(); };
+
+  RenderTextHarfBuzz* GetRenderTextHarfBuzz() {
+    DCHECK_EQ(RENDER_TEXT_HARFBUZZ, GetParam());
+    return static_cast<RenderTextHarfBuzz*>(GetRenderText());
+  }
+
+#if defined(OS_MACOSX)
+  RenderTextMac* GetRenderTextMac() {
+    DCHECK_EQ(RENDER_TEXT_MAC, GetParam());
+    return static_cast<RenderTextMac*>(GetRenderText());
+  }
+#endif
+
+  Canvas* canvas() { return &canvas_; }
+  TestSkiaTextRenderer* renderer() { return &renderer_; }
+
  private:
+  std::unique_ptr<RenderText> render_text_;
+  std::unique_ptr<test::RenderTextTestApi> test_api_;
+  Canvas canvas_;
+  TestSkiaTextRenderer renderer_;
+
 #if defined(OS_WIN)
   // Needed to bypass DCHECK in GetFallbackFont.
   base::MessageLoopForUI message_loop_;
 #endif
+
+  DISALLOW_COPY_AND_ASSIGN(RenderTextTest);
 };
 
-TEST_F(RenderTextTest, DefaultStyles) {
+// Test fixture class. Use for tests which are only to be run for
+// RenderTextHarfBuzz.
+class RenderTextHarfBuzzTest : public RenderTextTest {
+ public:
+  RenderTextHarfBuzzTest() {}
+
+  // Overridden from testing::Test:
+  void SetUp() override { DCHECK_EQ(RENDER_TEXT_HARFBUZZ, GetParam()); }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(RenderTextHarfBuzzTest);
+};
+
+// Test fixture class. Use for tests which are only to be run for RenderTextMac.
+class RenderTextMacTest : public RenderTextTest {
+ public:
+  RenderTextMacTest() {}
+
+  // Overridden from testing::Test:
+  void SetUp() override { DCHECK_EQ(RENDER_TEXT_MAC, GetParam()); }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(RenderTextMacTest);
+};
+
+TEST_P(RenderTextTest, DefaultStyles) {
   // Check the default styles applied to new instances and adjusted text.
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  RenderText* render_text = GetRenderText();
   EXPECT_TRUE(render_text->text().empty());
   const wchar_t* const cases[] = { kWeak, kLtr, L"Hello", kRtl, L"", L"" };
   for (size_t i = 0; i < arraysize(cases); ++i) {
     EXPECT_TRUE(render_text->colors().EqualsValueForTesting(SK_ColorBLACK));
     EXPECT_TRUE(
         render_text->baselines().EqualsValueForTesting(NORMAL_BASELINE));
     for (size_t style = 0; style < NUM_TEXT_STYLES; ++style)
       EXPECT_TRUE(render_text->styles()[style].EqualsValueForTesting(false));
     render_text->SetText(WideToUTF16(cases[i]));
   }
 }
 
-TEST_F(RenderTextTest, SetStyles) {
+TEST_P(RenderTextTest, SetStyles) {
   // Ensure custom default styles persist across setting and clearing text.
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  RenderText* render_text = GetRenderText();
   const SkColor color = SK_ColorRED;
   render_text->SetColor(color);
   render_text->SetBaselineStyle(SUPERSCRIPT);
   render_text->SetWeight(Font::Weight::BOLD);
   render_text->SetStyle(UNDERLINE, false);
   const wchar_t* const cases[] = { kWeak, kLtr, L"Hello", kRtl, L"", L"" };
   for (size_t i = 0; i < arraysize(cases); ++i) {
     EXPECT_TRUE(render_text->colors().EqualsValueForTesting(color));
     EXPECT_TRUE(render_text->baselines().EqualsValueForTesting(SUPERSCRIPT));
     EXPECT_TRUE(
         render_text->weights().EqualsValueForTesting(Font::Weight::BOLD));
     EXPECT_TRUE(render_text->styles()[UNDERLINE].EqualsValueForTesting(false));
     render_text->SetText(WideToUTF16(cases[i]));
 
     // Ensure custom default styles can be applied after text has been set.
     if (i == 1)
       render_text->SetStyle(STRIKE, true);
     if (i >= 1)
       EXPECT_TRUE(render_text->styles()[STRIKE].EqualsValueForTesting(true));
   }
 }
 
-TEST_F(RenderTextTest, ApplyStyles) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+TEST_P(RenderTextTest, ApplyStyles) {
+  RenderText* render_text = GetRenderText();
   render_text->SetText(ASCIIToUTF16("012345678"));
 
   // Apply a ranged color and style and check the resulting breaks.
   render_text->ApplyColor(SK_ColorRED, Range(1, 4));
   render_text->ApplyBaselineStyle(SUPERIOR, Range(2, 4));
   render_text->ApplyWeight(Font::Weight::BOLD, Range(2, 5));
   std::vector<std::pair<size_t, SkColor> > expected_color;
   expected_color.push_back(std::pair<size_t, SkColor>(0, SK_ColorBLACK));
   expected_color.push_back(std::pair<size_t, SkColor>(1, SK_ColorRED));
   expected_color.push_back(std::pair<size_t, SkColor>(4, SK_ColorBLACK));
@@ skipping 66 matching lines @@
   EXPECT_TRUE(render_text->styles()[ITALIC].EqualsForTesting(expected_italic));
   render_text->ApplyStyle(ITALIC, false, Range(0, 1));
   render_text->SetText(ASCIIToUTF16("0123456"));
   expected_italic.begin()->second = false;
   EXPECT_TRUE(render_text->styles()[ITALIC].EqualsForTesting(expected_italic));
   render_text->ApplyStyle(ITALIC, true, Range(2, 4));
   render_text->SetText(ASCIIToUTF16("012345678"));
   EXPECT_TRUE(render_text->styles()[ITALIC].EqualsForTesting(expected_italic));
 
   // TODO(tmoniuszko): Enable when RenderTextMac::IsValidCursorIndex is
-  //                   implemented.
-#if !defined(OS_MACOSX)
-  // Styles shouldn't be changed mid-grapheme.
-  render_text->SetText(WideToUTF16(
-      L"0" L"\x0915\x093f" L"1" L"\x0915\x093f" L"2"));
-  render_text->ApplyStyle(UNDERLINE, true, Range(2, 5));
-  std::vector<std::pair<size_t, bool> > expected_underline;
-  expected_underline.push_back(std::pair<size_t, bool>(0, false));
-  expected_underline.push_back(std::pair<size_t, bool>(1, true));
-  expected_underline.push_back(std::pair<size_t, bool>(6, false));
-  EXPECT_TRUE(render_text->styles()[UNDERLINE].EqualsForTesting(
-      expected_underline));
-#endif  // !defined(OS_MACOSX)
+  //                   implemented. See http://crbug.com/131618.
+  if (GetParam() != RENDER_TEXT_MAC) {
+    // Styles shouldn't be changed mid-grapheme.
+    render_text->SetText(
+        WideToUTF16(L"0"
+                    L"\x0915\x093f"
+                    L"1"
+                    L"\x0915\x093f"
+                    L"2"));
+    render_text->ApplyStyle(UNDERLINE, true, Range(2, 5));
+    std::vector<std::pair<size_t, bool>> expected_underline;
+    expected_underline.push_back(std::pair<size_t, bool>(0, false));
+    expected_underline.push_back(std::pair<size_t, bool>(1, true));
+    expected_underline.push_back(std::pair<size_t, bool>(6, false));
+    EXPECT_TRUE(
+        render_text->styles()[UNDERLINE].EqualsForTesting(expected_underline));
+  }
 }
 
-TEST_F(RenderTextTest, AppendTextKeepsStyles) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+TEST_P(RenderTextTest, AppendTextKeepsStyles) {
+  RenderText* render_text = GetRenderText();
   // Setup basic functionality.
   render_text->SetText(ASCIIToUTF16("abc"));
   render_text->ApplyColor(SK_ColorRED, Range(0, 1));
   render_text->ApplyBaselineStyle(SUPERSCRIPT, Range(1, 2));
   render_text->ApplyStyle(UNDERLINE, true, Range(2, 3));
   // Verify basic functionality.
   std::vector<std::pair<size_t, SkColor>> expected_color;
   expected_color.push_back(std::pair<size_t, SkColor>(0, SK_ColorRED));
   expected_color.push_back(std::pair<size_t, SkColor>(1, SK_ColorBLACK));
   EXPECT_TRUE(render_text->colors().EqualsForTesting(expected_color));
@@ skipping 42 matching lines @@
               render_text->selection_model());
   }
   render_text->MoveCursor(WORD_BREAK, CURSOR_RIGHT, selection_behavior);
   EXPECT_EQ(SelectionModel(Range(select ? 0 : len, len), CURSOR_FORWARD),
             render_text->selection_model());
   render_text->MoveCursor(WORD_BREAK, CURSOR_LEFT, selection_behavior);
   EXPECT_EQ(SelectionModel(0, CURSOR_BACKWARD), render_text->selection_model());
 }
 
 // TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
-#if !defined(OS_MACOSX)
-TEST_F(RenderTextTest, ObscuredText) {
+TEST_P(RenderTextHarfBuzzTest, ObscuredText) {
   const base::string16 seuss = ASCIIToUTF16("hop on pop");
   const base::string16 no_seuss = ASCIIToUTF16("**********");
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  RenderText* render_text = GetRenderText();
 
   // GetLayoutText() returns asterisks when the obscured bit is set.
   render_text->SetText(seuss);
   render_text->SetObscured(true);
   EXPECT_EQ(seuss, render_text->text());
   EXPECT_EQ(no_seuss, render_text->GetDisplayText());
   render_text->SetObscured(false);
   EXPECT_EQ(seuss, render_text->text());
   EXPECT_EQ(seuss, render_text->GetDisplayText());
 
@@ skipping 34 matching lines @@
             static_cast<int>(render_text->GetGlyphBounds(0U).length()));
 
   // Cursoring is independent of underlying characters when text is obscured.
   const wchar_t* const texts[] = {
     kWeak, kLtr, kLtrRtl, kLtrRtlLtr, kRtl, kRtlLtr, kRtlLtrRtl,
     L"hop on pop",                              // Check LTR word boundaries.
     L"\x05d0\x05d1 \x05d0\x05d2 \x05d1\x05d2",  // Check RTL word boundaries.
   };
   for (size_t i = 0; i < arraysize(texts); ++i) {
     base::string16 text = WideToUTF16(texts[i]);
-    TestVisualCursorMotionInObscuredField(render_text.get(), text,
-                                          SELECTION_NONE);
-    TestVisualCursorMotionInObscuredField(render_text.get(), text,
-                                          SELECTION_RETAIN);
+    TestVisualCursorMotionInObscuredField(render_text, text, SELECTION_NONE);
+    TestVisualCursorMotionInObscuredField(render_text, text, SELECTION_RETAIN);
   }
 }
-#endif  // !defined(OS_MACOSX)
 
-TEST_F(RenderTextTest, RevealObscuredText) {
+TEST_P(RenderTextTest, RevealObscuredText) {
   const base::string16 seuss = ASCIIToUTF16("hop on pop");
   const base::string16 no_seuss = ASCIIToUTF16("**********");
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  RenderText* render_text = GetRenderText();
 
   render_text->SetText(seuss);
   render_text->SetObscured(true);
   EXPECT_EQ(seuss, render_text->text());
   EXPECT_EQ(no_seuss, render_text->GetDisplayText());
 
   // Valid reveal index and new revealed index clears previous one.
   render_text->RenderText::SetObscuredRevealIndex(0);
   EXPECT_EQ(ASCIIToUTF16("h*********"), render_text->GetDisplayText());
   render_text->RenderText::SetObscuredRevealIndex(1);
@@ skipping 50 matching lines @@
   render_text->RenderText::SetObscuredRevealIndex(2);
   EXPECT_EQ(ASCIIToUTF16("*h***"), render_text->GetDisplayText());
   render_text->RenderText::SetObscuredRevealIndex(5);
   const base::char16 valid_expect_5_and_6[] =
       {'*', '*', '*', '*', 0xD800, 0xDC00, 0};
   EXPECT_EQ(valid_expect_5_and_6, render_text->GetDisplayText());
   render_text->RenderText::SetObscuredRevealIndex(6);
   EXPECT_EQ(valid_expect_5_and_6, render_text->GetDisplayText());
 }
 
-TEST_F(RenderTextTest, ObscuredEmoji) {
+TEST_P(RenderTextTest, ObscuredEmoji) {
   // Ensures text itemization doesn't crash on obscured multi-char glyphs.
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  RenderText* render_text = GetRenderText();
   render_text->SetObscured(true);
-  Canvas canvas;
   // Test the "Grinning face with smiling eyes" character followed by 'y'.
   render_text->SetText(UTF8ToUTF16("\xF0\x9F\x98\x81y"));
-  render_text->Draw(&canvas);
+  render_text->Draw(canvas());
   // Test two "Camera" characters in a row.
   render_text->SetText(UTF8ToUTF16("\xF0\x9F\x93\xB7\xF0\x9F\x93\xB7"));
-  render_text->Draw(&canvas);
+  render_text->Draw(canvas());
 }
 
 // TODO(PORT): Fails for RenderTextMac.
+// Crashes on Mac with RenderTextHarfBuzz. See http://crbug.com/640068.
 #if !defined(OS_MACOSX)
 
-TEST_F(RenderTextTest, ElidedText) {
+TEST_P(RenderTextTest, ElidedText) {
   // TODO(skanuj) : Add more test cases for following
   // - RenderText styles.
   // - Cross interaction of truncate, elide and obscure.
   // - ElideText tests from text_elider.cc.
   struct {
     const wchar_t* text;
     const wchar_t* display_text;
     const bool elision_expected;
   } cases[] = {
     // Strings shorter than the elision width should be laid out in full.
@@ skipping 28 matching lines @@
     // U+05E9 U+05BC U+05C1 U+05B8 forms a four-character compound glyph. Again,
     // it should be either fully elided, or not elided at all. If completely
     // elided, an LTR Mark (U+200E) should be added.
     { L"0\x05e9\x05bc\x05c1\x05b8",   L"0\x05e9\x05bc\x05c1\x05b8", false },
     { L"0\x05e9\x05bc\x05c1\x05b8",   L"0\x2026\x200E"            , true  },
     { L"01\x05e9\x05bc\x05c1\x05b8",  L"01\x2026\x200E"           , true  },
     { L"012\x05e9\x05bc\x05c1\x05b8", L"012\x2026\x200E"          , true  },
     { L"012\xF0\x9D\x84\x9E",         L"012\xF0\x2026"            , true  },
   };
 
-  std::unique_ptr<RenderText> expected_render_text(
-      RenderText::CreateInstance());
+  std::unique_ptr<RenderText> expected_render_text(CreateRenderTextInstance());
   expected_render_text->SetFontList(FontList("serif, Sans serif, 12px"));
   expected_render_text->SetDisplayRect(Rect(0, 0, 9999, 100));
 
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  RenderText* render_text = GetRenderText();
   render_text->SetFontList(FontList("serif, Sans serif, 12px"));
   render_text->SetElideBehavior(ELIDE_TAIL);
 
   for (size_t i = 0; i < arraysize(cases); i++) {
     SCOPED_TRACE(base::StringPrintf("Testing cases[%" PRIuS "] '%ls'", i,
                                     cases[i].text));
 
     // Compute expected width
     expected_render_text->SetText(WideToUTF16(cases[i].display_text));
     int expected_width = expected_render_text->GetContentWidth();
 
     base::string16 input = WideToUTF16(cases[i].text);
     // Extend the input text to ensure that it is wider than the display_text,
     // and so it will get elided.
     if (cases[i].elision_expected)
       input.append(WideToUTF16(L" MMMMMMMMMMM"));
     render_text->SetText(input);
     render_text->SetDisplayRect(Rect(0, 0, expected_width, 100));
     EXPECT_EQ(input, render_text->text());
     EXPECT_EQ(WideToUTF16(cases[i].display_text),
               render_text->GetDisplayText());
     expected_render_text->SetText(base::string16());
   }
 }
 
-TEST_F(RenderTextTest, ElidedObscuredText) {
-  std::unique_ptr<RenderText> expected_render_text(
-      RenderText::CreateInstance());
+TEST_P(RenderTextTest, ElidedObscuredText) {
+  std::unique_ptr<RenderText> expected_render_text(CreateRenderTextInstance());
   expected_render_text->SetFontList(FontList("serif, Sans serif, 12px"));
   expected_render_text->SetDisplayRect(Rect(0, 0, 9999, 100));
   expected_render_text->SetText(WideToUTF16(L"**\x2026"));
 
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  RenderText* render_text = GetRenderText();
   render_text->SetFontList(FontList("serif, Sans serif, 12px"));
   render_text->SetElideBehavior(ELIDE_TAIL);
   render_text->SetDisplayRect(
       Rect(0, 0, expected_render_text->GetContentWidth(), 100));
   render_text->SetObscured(true);
   render_text->SetText(WideToUTF16(L"abcdef"));
   EXPECT_EQ(WideToUTF16(L"abcdef"), render_text->text());
   EXPECT_EQ(WideToUTF16(L"**\x2026"), render_text->GetDisplayText());
 }
 
-TEST_F(RenderTextTest, MultilineElide) {
-  std::unique_ptr<RenderText> render_text(new RenderTextHarfBuzz);
+#endif  // !defined(OS_MACOSX)
+
+// TODO(PORT): Fails for RenderTextMac.
+TEST_P(RenderTextHarfBuzzTest, MultilineElide) {
+  RenderText* render_text = GetRenderText();
   base::string16 input_text;
   // Aim for 3 lines of text.
   for (int i = 0; i < 20; ++i)
     input_text.append(ASCIIToUTF16("hello world "));
   render_text->SetText(input_text);
   // Apply a style that tweaks the layout to make sure elision is calculated
   // with these styles. This can expose a behavior in layout where text is
   // slightly different width. This must be done after |SetText()|.
   render_text->ApplyWeight(Font::Weight::BOLD, Range(1, 20));
   render_text->ApplyStyle(ITALIC, true, Range(1, 20));
@@ skipping 31 matching lines @@
   EXPECT_EQ(input_text, render_text->GetDisplayText());
 
   // And put it back.
   render_text->SetMaxLines(3);
   render_text->GetStringSize();
   EXPECT_LT(actual_text.size(), input_text.size());
   EXPECT_EQ(actual_text, input_text.substr(0, actual_text.size() - 1) +
                              base::string16(kEllipsisUTF16));
 }
 
-#endif  // !defined(OS_MACOSX)
-
-TEST_F(RenderTextTest, ElidedEmail) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+TEST_P(RenderTextTest, ElidedEmail) {
+  RenderText* render_text = GetRenderText();
   render_text->SetText(ASCIIToUTF16("test@example.com"));
   const Size size = render_text->GetStringSize();
 
   const base::string16 long_email =
       ASCIIToUTF16("longemailaddresstest@example.com");
   render_text->SetText(long_email);
   render_text->SetElideBehavior(ELIDE_EMAIL);
   render_text->SetDisplayRect(Rect(size));
   EXPECT_GE(size.width(), render_text->GetStringSize().width());
   EXPECT_GT(long_email.size(), render_text->GetDisplayText().size());
 }
 
-TEST_F(RenderTextTest, TruncatedText) {
+TEST_P(RenderTextTest, TruncatedText) {
   struct {
     const wchar_t* text;
     const wchar_t* display_text;
   } cases[] = {
     // Strings shorter than the truncation length should be laid out in full.
     { L"",        L""        },
     { kWeak,      kWeak      },
     { kLtr,       kLtr       },
     { kLtrRtl,    kLtrRtl    },
     { kLtrRtlLtr, kLtrRtlLtr },
@@ skipping 14 matching lines @@
     // Surrogate pairs should be truncated reasonably enough.
     { L"0123\x0915\x093f",              L"0123\x2026"                },
     { L"0\x05e9\x05bc\x05c1\x05b8",     L"0\x05e9\x05bc\x05c1\x05b8" },
     { L"01\x05e9\x05bc\x05c1\x05b8",    L"01\x05e9\x05bc\x2026"      },
     { L"012\x05e9\x05bc\x05c1\x05b8",   L"012\x05e9\x2026"           },
     { L"0123\x05e9\x05bc\x05c1\x05b8",  L"0123\x2026"                },
     { L"01234\x05e9\x05bc\x05c1\x05b8", L"0123\x2026"                },
     { L"012\xF0\x9D\x84\x9E",           L"012\xF0\x2026"             },
   };
 
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  RenderText* render_text = GetRenderText();
   render_text->set_truncate_length(5);
   for (size_t i = 0; i < arraysize(cases); i++) {
     render_text->SetText(WideToUTF16(cases[i].text));
     EXPECT_EQ(WideToUTF16(cases[i].text), render_text->text());
     EXPECT_EQ(WideToUTF16(cases[i].display_text), render_text->GetDisplayText())
         << "For case " << i << ": " << cases[i].text;
   }
 }
 
-TEST_F(RenderTextTest, TruncatedObscuredText) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+TEST_P(RenderTextTest, TruncatedObscuredText) {
+  RenderText* render_text = GetRenderText();
   render_text->set_truncate_length(3);
   render_text->SetObscured(true);
   render_text->SetText(WideToUTF16(L"abcdef"));
   EXPECT_EQ(WideToUTF16(L"abcdef"), render_text->text());
   EXPECT_EQ(WideToUTF16(L"**\x2026"), render_text->GetDisplayText());
 }
 
 // TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
-#if !defined(OS_MACOSX)
-TEST_F(RenderTextTest, TruncatedCursorMovementLTR) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+TEST_P(RenderTextHarfBuzzTest, TruncatedCursorMovementLTR) {
+  RenderText* render_text = GetRenderText();
   render_text->set_truncate_length(2);
   render_text->SetText(WideToUTF16(L"abcd"));
 
   EXPECT_EQ(SelectionModel(0, CURSOR_BACKWARD), render_text->selection_model());
   render_text->MoveCursor(LINE_BREAK, CURSOR_RIGHT, SELECTION_NONE);
   EXPECT_EQ(SelectionModel(4, CURSOR_FORWARD), render_text->selection_model());
   render_text->MoveCursor(LINE_BREAK, CURSOR_LEFT, SELECTION_NONE);
   EXPECT_EQ(SelectionModel(0, CURSOR_BACKWARD), render_text->selection_model());
 
   std::vector<SelectionModel> expected;
   expected.push_back(SelectionModel(0, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(1, CURSOR_BACKWARD));
   // The cursor hops over the ellipsis and elided text to the line end.
   expected.push_back(SelectionModel(4, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(4, CURSOR_FORWARD));
-  RunMoveCursorLeftRightTest(render_text.get(), expected, CURSOR_RIGHT);
+  RunMoveCursorLeftRightTest(render_text, expected, CURSOR_RIGHT);
 
   expected.clear();
   expected.push_back(SelectionModel(4, CURSOR_FORWARD));
   // The cursor hops over the elided text to preceeding text.
   expected.push_back(SelectionModel(1, CURSOR_FORWARD));
   expected.push_back(SelectionModel(0, CURSOR_FORWARD));
   expected.push_back(SelectionModel(0, CURSOR_BACKWARD));
-  RunMoveCursorLeftRightTest(render_text.get(), expected, CURSOR_LEFT);
+  RunMoveCursorLeftRightTest(render_text, expected, CURSOR_LEFT);
 }
 
-TEST_F(RenderTextTest, TruncatedCursorMovementRTL) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+// TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
+TEST_P(RenderTextHarfBuzzTest, TruncatedCursorMovementRTL) {
+  RenderText* render_text = GetRenderText();
   render_text->set_truncate_length(2);
   render_text->SetText(WideToUTF16(L"\x5d0\x5d1\x5d2\x5d3"));
 
   EXPECT_EQ(SelectionModel(0, CURSOR_BACKWARD), render_text->selection_model());
   render_text->MoveCursor(LINE_BREAK, CURSOR_LEFT, SELECTION_NONE);
   EXPECT_EQ(SelectionModel(4, CURSOR_FORWARD), render_text->selection_model());
   render_text->MoveCursor(LINE_BREAK, CURSOR_RIGHT, SELECTION_NONE);
   EXPECT_EQ(SelectionModel(0, CURSOR_BACKWARD), render_text->selection_model());
 
   std::vector<SelectionModel> expected;
   expected.push_back(SelectionModel(0, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(1, CURSOR_BACKWARD));
   // The cursor hops over the ellipsis and elided text to the line end.
   expected.push_back(SelectionModel(4, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(4, CURSOR_FORWARD));
-  RunMoveCursorLeftRightTest(render_text.get(), expected, CURSOR_LEFT);
+  RunMoveCursorLeftRightTest(render_text, expected, CURSOR_LEFT);
 
   expected.clear();
   expected.push_back(SelectionModel(4, CURSOR_FORWARD));
   // The cursor hops over the elided text to preceeding text.
   expected.push_back(SelectionModel(1, CURSOR_FORWARD));
   expected.push_back(SelectionModel(0, CURSOR_FORWARD));
   expected.push_back(SelectionModel(0, CURSOR_BACKWARD));
-  RunMoveCursorLeftRightTest(render_text.get(), expected, CURSOR_RIGHT);
+  RunMoveCursorLeftRightTest(render_text, expected, CURSOR_RIGHT);
 }
-#endif  // !defined(OS_MACOSX)
 
-TEST_F(RenderTextTest, MoveCursor_Character) {
-  std::unique_ptr<RenderText> render_text(
-      RenderText::CreateInstanceForEditing());
+// TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
+TEST_P(RenderTextHarfBuzzTest, MoveCursor_Character) {
+  RenderText* render_text = GetRenderText();
   render_text->SetText(WideToUTF16(L"123 456 789"));
   std::vector<Range> expected;
 
   // SELECTION_NONE.
   render_text->SelectRange(Range(6));
 
   // Move right twice.
   expected.push_back(Range(7));
   expected.push_back(Range(8));
-  RunMoveCursorTestAndClearExpectations(render_text.get(), CHARACTER_BREAK,
-                                        CURSOR_RIGHT, SELECTION_NONE,
-                                        &expected);
+  RunMoveCursorTestAndClearExpectations(
+      render_text, CHARACTER_BREAK, CURSOR_RIGHT, SELECTION_NONE, &expected);
 
   // Move left twice.
   expected.push_back(Range(7));
   expected.push_back(Range(6));
-  RunMoveCursorTestAndClearExpectations(render_text.get(), CHARACTER_BREAK,
+  RunMoveCursorTestAndClearExpectations(render_text, CHARACTER_BREAK,
                                         CURSOR_LEFT, SELECTION_NONE, &expected);
 
   // SELECTION_CARET.
   render_text->SelectRange(Range(6));
   expected.push_back(Range(6, 7));
 
   // Move right.
-  RunMoveCursorTestAndClearExpectations(render_text.get(), CHARACTER_BREAK,
-                                        CURSOR_RIGHT, SELECTION_CARET,
-                                        &expected);
+  RunMoveCursorTestAndClearExpectations(
+      render_text, CHARACTER_BREAK, CURSOR_RIGHT, SELECTION_CARET, &expected);
 
   // Move left twice.
   expected.push_back(Range(6));
   expected.push_back(Range(6, 5));
-  RunMoveCursorTestAndClearExpectations(render_text.get(), CHARACTER_BREAK,
-                                        CURSOR_LEFT, SELECTION_CARET,
-                                        &expected);
+  RunMoveCursorTestAndClearExpectations(
+      render_text, CHARACTER_BREAK, CURSOR_LEFT, SELECTION_CARET, &expected);
 
   // SELECTION_RETAIN.
   render_text->SelectRange(Range(6));
 
   // Move right.
   expected.push_back(Range(6, 7));
-  RunMoveCursorTestAndClearExpectations(render_text.get(), CHARACTER_BREAK,
-                                        CURSOR_RIGHT, SELECTION_RETAIN,
-                                        &expected);
+  RunMoveCursorTestAndClearExpectations(
+      render_text, CHARACTER_BREAK, CURSOR_RIGHT, SELECTION_RETAIN, &expected);
 
   // Move left twice.
   expected.push_back(Range(6));
   expected.push_back(Range(6, 5));
-  RunMoveCursorTestAndClearExpectations(render_text.get(), CHARACTER_BREAK,
-                                        CURSOR_LEFT, SELECTION_RETAIN,
-                                        &expected);
+  RunMoveCursorTestAndClearExpectations(
+      render_text, CHARACTER_BREAK, CURSOR_LEFT, SELECTION_RETAIN, &expected);
 
   // SELECTION_EXTEND.
   render_text->SelectRange(Range(6));
 
   // Move right.
   expected.push_back(Range(6, 7));
-  RunMoveCursorTestAndClearExpectations(render_text.get(), CHARACTER_BREAK,
-                                        CURSOR_RIGHT, SELECTION_EXTEND,
-                                        &expected);
+  RunMoveCursorTestAndClearExpectations(
+      render_text, CHARACTER_BREAK, CURSOR_RIGHT, SELECTION_EXTEND, &expected);
 
   // Move left twice.
   expected.push_back(Range(7, 6));
   expected.push_back(Range(7, 5));
-  RunMoveCursorTestAndClearExpectations(render_text.get(), CHARACTER_BREAK,
-                                        CURSOR_LEFT, SELECTION_EXTEND,
-                                        &expected);
+  RunMoveCursorTestAndClearExpectations(
+      render_text, CHARACTER_BREAK, CURSOR_LEFT, SELECTION_EXTEND, &expected);
 }
 
-TEST_F(RenderTextTest, MoveCursor_Word) {
-  std::unique_ptr<RenderText> render_text(
-      RenderText::CreateInstanceForEditing());
+// TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
+TEST_P(RenderTextHarfBuzzTest, MoveCursor_Word) {
+  RenderText* render_text = GetRenderText();
   render_text->SetText(WideToUTF16(L"123 456 789"));
   std::vector<Range> expected;
 
   // SELECTION_NONE.
   render_text->SelectRange(Range(6));
 
   // Move left twice.
   expected.push_back(Range(4));
   expected.push_back(Range(0));
-  RunMoveCursorTestAndClearExpectations(render_text.get(), WORD_BREAK,
-                                        CURSOR_LEFT, SELECTION_NONE, &expected);
+  RunMoveCursorTestAndClearExpectations(render_text, WORD_BREAK, CURSOR_LEFT,
+                                        SELECTION_NONE, &expected);
 
   // Move right twice.
   expected.push_back(Range(3));
   expected.push_back(Range(7));
-  RunMoveCursorTestAndClearExpectations(
-      render_text.get(), WORD_BREAK, CURSOR_RIGHT, SELECTION_NONE, &expected);
+  RunMoveCursorTestAndClearExpectations(render_text, WORD_BREAK, CURSOR_RIGHT,
+                                        SELECTION_NONE, &expected);
 
   // SELECTION_CARET.
   render_text->SelectRange(Range(6));
 
   // Move left.
   expected.push_back(Range(6, 4));
-  RunMoveCursorTestAndClearExpectations(
-      render_text.get(), WORD_BREAK, CURSOR_LEFT, SELECTION_CARET, &expected);
+  RunMoveCursorTestAndClearExpectations(render_text, WORD_BREAK, CURSOR_LEFT,
+                                        SELECTION_CARET, &expected);
 
   // Move right twice.
   expected.push_back(Range(6));
   expected.push_back(Range(6, 7));
-  RunMoveCursorTestAndClearExpectations(
-      render_text.get(), WORD_BREAK, CURSOR_RIGHT, SELECTION_CARET, &expected);
+  RunMoveCursorTestAndClearExpectations(render_text, WORD_BREAK, CURSOR_RIGHT,
+                                        SELECTION_CARET, &expected);
 
   // Move left.
   expected.push_back(Range(6));
-  RunMoveCursorTestAndClearExpectations(
-      render_text.get(), WORD_BREAK, CURSOR_LEFT, SELECTION_CARET, &expected);
+  RunMoveCursorTestAndClearExpectations(render_text, WORD_BREAK, CURSOR_LEFT,
+                                        SELECTION_CARET, &expected);
 
   // SELECTION_RETAIN.
   render_text->SelectRange(Range(6));
 
   // Move left.
   expected.push_back(Range(6, 4));
-  RunMoveCursorTestAndClearExpectations(
-      render_text.get(), WORD_BREAK, CURSOR_LEFT, SELECTION_RETAIN, &expected);
+  RunMoveCursorTestAndClearExpectations(render_text, WORD_BREAK, CURSOR_LEFT,
+                                        SELECTION_RETAIN, &expected);
 
   // Move right twice.
   expected.push_back(Range(6, 7));
   expected.push_back(Range(6, 11));
-  RunMoveCursorTestAndClearExpectations(
-      render_text.get(), WORD_BREAK, CURSOR_RIGHT, SELECTION_RETAIN, &expected);
+  RunMoveCursorTestAndClearExpectations(render_text, WORD_BREAK, CURSOR_RIGHT,
+                                        SELECTION_RETAIN, &expected);
 
   // Move left.
   expected.push_back(Range(6, 8));
-  RunMoveCursorTestAndClearExpectations(
-      render_text.get(), WORD_BREAK, CURSOR_LEFT, SELECTION_RETAIN, &expected);
+  RunMoveCursorTestAndClearExpectations(render_text, WORD_BREAK, CURSOR_LEFT,
+                                        SELECTION_RETAIN, &expected);
 
   // SELECTION_EXTEND.
   render_text->SelectRange(Range(6));
 
   // Move left.
   expected.push_back(Range(6, 4));
-  RunMoveCursorTestAndClearExpectations(
-      render_text.get(), WORD_BREAK, CURSOR_LEFT, SELECTION_EXTEND, &expected);
+  RunMoveCursorTestAndClearExpectations(render_text, WORD_BREAK, CURSOR_LEFT,
+                                        SELECTION_EXTEND, &expected);
 
   // Move right twice.
   expected.push_back(Range(4, 7));
   expected.push_back(Range(4, 11));
-  RunMoveCursorTestAndClearExpectations(
-      render_text.get(), WORD_BREAK, CURSOR_RIGHT, SELECTION_EXTEND, &expected);
+  RunMoveCursorTestAndClearExpectations(render_text, WORD_BREAK, CURSOR_RIGHT,
+                                        SELECTION_EXTEND, &expected);
 
   // Move left.
   expected.push_back(Range(4, 8));
-  RunMoveCursorTestAndClearExpectations(
-      render_text.get(), WORD_BREAK, CURSOR_LEFT, SELECTION_EXTEND, &expected);
+  RunMoveCursorTestAndClearExpectations(render_text, WORD_BREAK, CURSOR_LEFT,
+                                        SELECTION_EXTEND, &expected);
 }
 
-TEST_F(RenderTextTest, MoveCursor_Line) {
-  std::unique_ptr<RenderText> render_text(
-      RenderText::CreateInstanceForEditing());
+TEST_P(RenderTextTest, MoveCursor_Line) {
+  RenderText* render_text = GetRenderText();
   render_text->SetText(WideToUTF16(L"123 456 789"));
   std::vector<Range> expected;
 
   // SELECTION_NONE.
   render_text->SelectRange(Range(6));
 
   // Move right twice.
   expected.push_back(Range(11));
   expected.push_back(Range(11));
-  RunMoveCursorTestAndClearExpectations(
-      render_text.get(), LINE_BREAK, CURSOR_RIGHT, SELECTION_NONE, &expected);
+  RunMoveCursorTestAndClearExpectations(render_text, LINE_BREAK, CURSOR_RIGHT,
+                                        SELECTION_NONE, &expected);
 
   // Move left twice.
   expected.push_back(Range(0));
   expected.push_back(Range(0));
-  RunMoveCursorTestAndClearExpectations(render_text.get(), LINE_BREAK,
-                                        CURSOR_LEFT, SELECTION_NONE, &expected);
+  RunMoveCursorTestAndClearExpectations(render_text, LINE_BREAK, CURSOR_LEFT,
+                                        SELECTION_NONE, &expected);
 
   // SELECTION_CARET.
   render_text->SelectRange(Range(6));
 
   // Move right.
   expected.push_back(Range(6, 11));
-  RunMoveCursorTestAndClearExpectations(
-      render_text.get(), LINE_BREAK, CURSOR_RIGHT, SELECTION_CARET, &expected);
+  RunMoveCursorTestAndClearExpectations(render_text, LINE_BREAK, CURSOR_RIGHT,
+                                        SELECTION_CARET, &expected);
 
   // Move left twice.
   expected.push_back(Range(6));
   expected.push_back(Range(6, 0));
-  RunMoveCursorTestAndClearExpectations(
-      render_text.get(), LINE_BREAK, CURSOR_LEFT, SELECTION_CARET, &expected);
+  RunMoveCursorTestAndClearExpectations(render_text, LINE_BREAK, CURSOR_LEFT,
+                                        SELECTION_CARET, &expected);
 
   // Move right.
   expected.push_back(Range(6));
-  RunMoveCursorTestAndClearExpectations(
-      render_text.get(), LINE_BREAK, CURSOR_RIGHT, SELECTION_CARET, &expected);
+  RunMoveCursorTestAndClearExpectations(render_text, LINE_BREAK, CURSOR_RIGHT,
+                                        SELECTION_CARET, &expected);
 
   // SELECTION_RETAIN.
   render_text->SelectRange(Range(6));
 
   // Move right.
   expected.push_back(Range(6, 11));
-  RunMoveCursorTestAndClearExpectations(
-      render_text.get(), LINE_BREAK, CURSOR_RIGHT, SELECTION_RETAIN, &expected);
+  RunMoveCursorTestAndClearExpectations(render_text, LINE_BREAK, CURSOR_RIGHT,
+                                        SELECTION_RETAIN, &expected);
 
   // Move left twice.
   expected.push_back(Range(6, 0));
   expected.push_back(Range(6, 0));
-  RunMoveCursorTestAndClearExpectations(
-      render_text.get(), LINE_BREAK, CURSOR_LEFT, SELECTION_RETAIN, &expected);
+  RunMoveCursorTestAndClearExpectations(render_text, LINE_BREAK, CURSOR_LEFT,
+                                        SELECTION_RETAIN, &expected);
 
   // Move right.
   expected.push_back(Range(6, 11));
-  RunMoveCursorTestAndClearExpectations(
-      render_text.get(), LINE_BREAK, CURSOR_RIGHT, SELECTION_RETAIN, &expected);
+  RunMoveCursorTestAndClearExpectations(render_text, LINE_BREAK, CURSOR_RIGHT,
+                                        SELECTION_RETAIN, &expected);
 
   // SELECTION_EXTEND.
   render_text->SelectRange(Range(6));
 
   // Move right.
   expected.push_back(Range(6, 11));
-  RunMoveCursorTestAndClearExpectations(
-      render_text.get(), LINE_BREAK, CURSOR_RIGHT, SELECTION_EXTEND, &expected);
+  RunMoveCursorTestAndClearExpectations(render_text, LINE_BREAK, CURSOR_RIGHT,
+                                        SELECTION_EXTEND, &expected);
 
   // Move left twice.
   expected.push_back(Range(11, 0));
   expected.push_back(Range(11, 0));
-  RunMoveCursorTestAndClearExpectations(
-      render_text.get(), LINE_BREAK, CURSOR_LEFT, SELECTION_EXTEND, &expected);
+  RunMoveCursorTestAndClearExpectations(render_text, LINE_BREAK, CURSOR_LEFT,
+                                        SELECTION_EXTEND, &expected);
 
   // Move right.
   expected.push_back(Range(0, 11));
-  RunMoveCursorTestAndClearExpectations(
-      render_text.get(), LINE_BREAK, CURSOR_RIGHT, SELECTION_EXTEND, &expected);
+  RunMoveCursorTestAndClearExpectations(render_text, LINE_BREAK, CURSOR_RIGHT,
+                                        SELECTION_EXTEND, &expected);
 }
 
-TEST_F(RenderTextTest, GetDisplayTextDirection) {
+TEST_P(RenderTextTest, GetDisplayTextDirection) {
   struct {
     const wchar_t* text;
     const base::i18n::TextDirection text_direction;
   } cases[] = {
     // Blank strings and those with no/weak directionality default to LTR.
     { L"",        base::i18n::LEFT_TO_RIGHT },
     { kWeak,      base::i18n::LEFT_TO_RIGHT },
     // Strings that begin with strong LTR characters.
     { kLtr,       base::i18n::LEFT_TO_RIGHT },
     { kLtrRtl,    base::i18n::LEFT_TO_RIGHT },
     { kLtrRtlLtr, base::i18n::LEFT_TO_RIGHT },
     // Strings that begin with strong RTL characters.
     { kRtl,       base::i18n::RIGHT_TO_LEFT },
     { kRtlLtr,    base::i18n::RIGHT_TO_LEFT },
     { kRtlLtrRtl, base::i18n::RIGHT_TO_LEFT },
   };
 
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  RenderText* render_text = GetRenderText();
   const bool was_rtl = base::i18n::IsRTL();
 
   for (size_t i = 0; i < 2; ++i) {
     // Toggle the application default text direction (to try each direction).
     SetRTL(!base::i18n::IsRTL());
     const base::i18n::TextDirection ui_direction = base::i18n::IsRTL() ?
         base::i18n::RIGHT_TO_LEFT : base::i18n::LEFT_TO_RIGHT;
 
     // Ensure that directionality modes yield the correct text directions.
     for (size_t j = 0; j < arraysize(cases); j++) {
@@ skipping 15 matching lines @@
 
   // Ensure that text changes update the direction for DIRECTIONALITY_FROM_TEXT.
   render_text->SetDirectionalityMode(DIRECTIONALITY_FROM_TEXT);
   render_text->SetText(WideToUTF16(kLtr));
   EXPECT_EQ(render_text->GetDisplayTextDirection(), base::i18n::LEFT_TO_RIGHT);
   render_text->SetText(WideToUTF16(kRtl));
   EXPECT_EQ(render_text->GetDisplayTextDirection(), base::i18n::RIGHT_TO_LEFT);
 }
 
 // TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
-#if !defined(OS_MACOSX)
-TEST_F(RenderTextTest, MoveCursorLeftRightInLtr) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
-
+TEST_P(RenderTextHarfBuzzTest, MoveCursorLeftRightInLtr) {
+  RenderText* render_text = GetRenderText();
   // Pure LTR.
   render_text->SetText(ASCIIToUTF16("abc"));
   // |expected| saves the expected SelectionModel when moving cursor from left
   // to right.
   std::vector<SelectionModel> expected;
   expected.push_back(SelectionModel(0, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(1, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(2, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(3, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(3, CURSOR_FORWARD));
-  RunMoveCursorLeftRightTest(render_text.get(), expected, CURSOR_RIGHT);
+  RunMoveCursorLeftRightTest(render_text, expected, CURSOR_RIGHT);
 
   expected.clear();
   expected.push_back(SelectionModel(3, CURSOR_FORWARD));
   expected.push_back(SelectionModel(2, CURSOR_FORWARD));
   expected.push_back(SelectionModel(1, CURSOR_FORWARD));
   expected.push_back(SelectionModel(0, CURSOR_FORWARD));
   expected.push_back(SelectionModel(0, CURSOR_BACKWARD));
-  RunMoveCursorLeftRightTest(render_text.get(), expected, CURSOR_LEFT);
+  RunMoveCursorLeftRightTest(render_text, expected, CURSOR_LEFT);
 }
 
-TEST_F(RenderTextTest, MoveCursorLeftRightInLtrRtl) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+// TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
+TEST_P(RenderTextHarfBuzzTest, MoveCursorLeftRightInLtrRtl) {
+  RenderText* render_text = GetRenderText();
   // LTR-RTL
   render_text->SetText(WideToUTF16(L"abc\x05d0\x05d1\x05d2"));
   // The last one is the expected END position.
   std::vector<SelectionModel> expected;
   expected.push_back(SelectionModel(0, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(1, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(2, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(3, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(5, CURSOR_FORWARD));
   expected.push_back(SelectionModel(4, CURSOR_FORWARD));
   expected.push_back(SelectionModel(3, CURSOR_FORWARD));
   expected.push_back(SelectionModel(6, CURSOR_FORWARD));
-  RunMoveCursorLeftRightTest(render_text.get(), expected, CURSOR_RIGHT);
+  RunMoveCursorLeftRightTest(render_text, expected, CURSOR_RIGHT);
 
   expected.clear();
   expected.push_back(SelectionModel(6, CURSOR_FORWARD));
   expected.push_back(SelectionModel(4, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(5, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(6, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(2, CURSOR_FORWARD));
   expected.push_back(SelectionModel(1, CURSOR_FORWARD));
   expected.push_back(SelectionModel(0, CURSOR_FORWARD));
   expected.push_back(SelectionModel(0, CURSOR_BACKWARD));
-  RunMoveCursorLeftRightTest(render_text.get(), expected, CURSOR_LEFT);
+  RunMoveCursorLeftRightTest(render_text, expected, CURSOR_LEFT);
 }
 
-TEST_F(RenderTextTest, MoveCursorLeftRightInLtrRtlLtr) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+// TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
+TEST_P(RenderTextHarfBuzzTest, MoveCursorLeftRightInLtrRtlLtr) {
+  RenderText* render_text = GetRenderText();
   // LTR-RTL-LTR.
   render_text->SetText(WideToUTF16(L"a" L"\x05d1" L"b"));
   std::vector<SelectionModel> expected;
   expected.push_back(SelectionModel(0, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(1, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(1, CURSOR_FORWARD));
   expected.push_back(SelectionModel(3, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(3, CURSOR_FORWARD));
-  RunMoveCursorLeftRightTest(render_text.get(), expected, CURSOR_RIGHT);
+  RunMoveCursorLeftRightTest(render_text, expected, CURSOR_RIGHT);
 
   expected.clear();
   expected.push_back(SelectionModel(3, CURSOR_FORWARD));
   expected.push_back(SelectionModel(2, CURSOR_FORWARD));
   expected.push_back(SelectionModel(2, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(0, CURSOR_FORWARD));
   expected.push_back(SelectionModel(0, CURSOR_BACKWARD));
-  RunMoveCursorLeftRightTest(render_text.get(), expected, CURSOR_LEFT);
+  RunMoveCursorLeftRightTest(render_text, expected, CURSOR_LEFT);
 }
 
-TEST_F(RenderTextTest, MoveCursorLeftRightInRtl) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+// TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
+TEST_P(RenderTextHarfBuzzTest, MoveCursorLeftRightInRtl) {
+  RenderText* render_text = GetRenderText();
   // Pure RTL.
   render_text->SetText(WideToUTF16(L"\x05d0\x05d1\x05d2"));
   render_text->MoveCursor(LINE_BREAK, CURSOR_RIGHT, SELECTION_NONE);
   std::vector<SelectionModel> expected;
 
   expected.push_back(SelectionModel(0, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(1, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(2, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(3, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(3, CURSOR_FORWARD));
-  RunMoveCursorLeftRightTest(render_text.get(), expected, CURSOR_LEFT);
+  RunMoveCursorLeftRightTest(render_text, expected, CURSOR_LEFT);
 
   expected.clear();
 
   expected.push_back(SelectionModel(3, CURSOR_FORWARD));
   expected.push_back(SelectionModel(2, CURSOR_FORWARD));
   expected.push_back(SelectionModel(1, CURSOR_FORWARD));
   expected.push_back(SelectionModel(0, CURSOR_FORWARD));
   expected.push_back(SelectionModel(0, CURSOR_BACKWARD));
-  RunMoveCursorLeftRightTest(render_text.get(), expected, CURSOR_RIGHT);
+  RunMoveCursorLeftRightTest(render_text, expected, CURSOR_RIGHT);
 }
 
-TEST_F(RenderTextTest, MoveCursorLeftRightInRtlLtr) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+// TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
+TEST_P(RenderTextHarfBuzzTest, MoveCursorLeftRightInRtlLtr) {
+  RenderText* render_text = GetRenderText();
   // RTL-LTR
   render_text->SetText(WideToUTF16(L"\x05d0\x05d1\x05d2" L"abc"));
   render_text->MoveCursor(LINE_BREAK, CURSOR_RIGHT, SELECTION_NONE);
   std::vector<SelectionModel> expected;
   expected.push_back(SelectionModel(0, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(1, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(2, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(3, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(5, CURSOR_FORWARD));
   expected.push_back(SelectionModel(4, CURSOR_FORWARD));
   expected.push_back(SelectionModel(3, CURSOR_FORWARD));
   expected.push_back(SelectionModel(6, CURSOR_FORWARD));
-  RunMoveCursorLeftRightTest(render_text.get(), expected, CURSOR_LEFT);
+  RunMoveCursorLeftRightTest(render_text, expected, CURSOR_LEFT);
 
   expected.clear();
   expected.push_back(SelectionModel(6, CURSOR_FORWARD));
   expected.push_back(SelectionModel(4, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(5, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(6, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(2, CURSOR_FORWARD));
   expected.push_back(SelectionModel(1, CURSOR_FORWARD));
   expected.push_back(SelectionModel(0, CURSOR_FORWARD));
   expected.push_back(SelectionModel(0, CURSOR_BACKWARD));
-  RunMoveCursorLeftRightTest(render_text.get(), expected, CURSOR_RIGHT);
+  RunMoveCursorLeftRightTest(render_text, expected, CURSOR_RIGHT);
 }
 
-TEST_F(RenderTextTest, MoveCursorLeftRightInRtlLtrRtl) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+// TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
+TEST_P(RenderTextHarfBuzzTest, MoveCursorLeftRightInRtlLtrRtl) {
+  RenderText* render_text = GetRenderText();
   // RTL-LTR-RTL.
   render_text->SetText(WideToUTF16(L"\x05d0" L"a" L"\x05d1"));
   render_text->MoveCursor(LINE_BREAK, CURSOR_RIGHT, SELECTION_NONE);
   std::vector<SelectionModel> expected;
   expected.push_back(SelectionModel(0, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(1, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(1, CURSOR_FORWARD));
   expected.push_back(SelectionModel(3, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(3, CURSOR_FORWARD));
-  RunMoveCursorLeftRightTest(render_text.get(), expected, CURSOR_LEFT);
+  RunMoveCursorLeftRightTest(render_text, expected, CURSOR_LEFT);
 
   expected.clear();
   expected.push_back(SelectionModel(3, CURSOR_FORWARD));
   expected.push_back(SelectionModel(2, CURSOR_FORWARD));
   expected.push_back(SelectionModel(2, CURSOR_BACKWARD));
   expected.push_back(SelectionModel(0, CURSOR_FORWARD));
   expected.push_back(SelectionModel(0, CURSOR_BACKWARD));
-  RunMoveCursorLeftRightTest(render_text.get(), expected, CURSOR_RIGHT);
+  RunMoveCursorLeftRightTest(render_text, expected, CURSOR_RIGHT);
 }
 
-TEST_F(RenderTextTest, MoveCursorLeftRight_ComplexScript) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
-
+// TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
+TEST_P(RenderTextHarfBuzzTest, MoveCursorLeftRight_ComplexScript) {
+  RenderText* render_text = GetRenderText();
   render_text->SetText(WideToUTF16(L"\x0915\x093f\x0915\x094d\x0915"));
   EXPECT_EQ(0U, render_text->cursor_position());
   render_text->MoveCursor(CHARACTER_BREAK, CURSOR_RIGHT, SELECTION_NONE);
   EXPECT_EQ(2U, render_text->cursor_position());
   render_text->MoveCursor(CHARACTER_BREAK, CURSOR_RIGHT, SELECTION_NONE);
   EXPECT_EQ(4U, render_text->cursor_position());
   render_text->MoveCursor(CHARACTER_BREAK, CURSOR_RIGHT, SELECTION_NONE);
   EXPECT_EQ(5U, render_text->cursor_position());
   render_text->MoveCursor(CHARACTER_BREAK, CURSOR_RIGHT, SELECTION_NONE);
   EXPECT_EQ(5U, render_text->cursor_position());
 
   render_text->MoveCursor(CHARACTER_BREAK, CURSOR_LEFT, SELECTION_NONE);
   EXPECT_EQ(4U, render_text->cursor_position());
   render_text->MoveCursor(CHARACTER_BREAK, CURSOR_LEFT, SELECTION_NONE);
   EXPECT_EQ(2U, render_text->cursor_position());
   render_text->MoveCursor(CHARACTER_BREAK, CURSOR_LEFT, SELECTION_NONE);
   EXPECT_EQ(0U, render_text->cursor_position());
   render_text->MoveCursor(CHARACTER_BREAK, CURSOR_LEFT, SELECTION_NONE);
   EXPECT_EQ(0U, render_text->cursor_position());
 }
 
-TEST_F(RenderTextTest, MoveCursorLeftRight_MeiryoUILigatures) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+// TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
+// Crashes on Mac with RenderTextHarfBuzz. See http://crbug.com/640068.
+#if !defined(OS_MACOSX)
+TEST_P(RenderTextHarfBuzzTest, MoveCursorLeftRight_MeiryoUILigatures) {
+  RenderText* render_text = GetRenderText();
   // Meiryo UI uses single-glyph ligatures for 'ff' and 'ffi', but each letter
   // (code point) has unique bounds, so mid-glyph cursoring should be possible.
   render_text->SetFontList(FontList("Meiryo UI, 12px"));
   render_text->SetText(WideToUTF16(L"ff ffi"));
   EXPECT_EQ(0U, render_text->cursor_position());
   for (size_t i = 0; i < render_text->text().length(); ++i) {
     render_text->MoveCursor(CHARACTER_BREAK, CURSOR_RIGHT, SELECTION_NONE);
     EXPECT_EQ(i + 1, render_text->cursor_position());
   }
   EXPECT_EQ(6U, render_text->cursor_position());
 }
+#endif  // !defined(OS_MACOSX)
 
-TEST_F(RenderTextTest, GraphemePositions) {
+// TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
+TEST_P(RenderTextHarfBuzzTest, GraphemePositions) {
   // LTR 2-character grapheme, LTR abc, LTR 2-character grapheme.
   const base::string16 kText1 =
       WideToUTF16(L"\x0915\x093f" L"abc" L"\x0915\x093f");
 
   // LTR ab, LTR 2-character grapheme, LTR cd.
   const base::string16 kText2 = WideToUTF16(L"ab" L"\x0915\x093f" L"cd");
 
   // The below is 'MUSICAL SYMBOL G CLEF', which is represented in UTF-16 as
   // two characters forming the surrogate pair 0x0001D11E.
   const std::string kSurrogate = "\xF0\x9D\x84\x9E";
@@ skipping 39 matching lines @@
     { kText3, 7, 6, 6 },
     { kText3, 50, 6, 6 },
   };
 
 #if defined(OS_WIN)
   // TODO(msw): XP fails due to lack of font support: http://crbug.com/106450
   if (base::win::GetVersion() < base::win::VERSION_VISTA)
     return;
 #endif
 
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  RenderText* render_text = GetRenderText();
   for (size_t i = 0; i < arraysize(cases); i++) {
     SCOPED_TRACE(base::StringPrintf("Testing cases[%" PRIuS "]", i));
     render_text->SetText(cases[i].text);
 
     size_t next = render_text->IndexOfAdjacentGrapheme(cases[i].index,
                                                        CURSOR_FORWARD);
     EXPECT_EQ(cases[i].expected_next, next);
     EXPECT_TRUE(render_text->IsValidCursorIndex(next));
 
     size_t previous = render_text->IndexOfAdjacentGrapheme(cases[i].index,
                                                            CURSOR_BACKWARD);
     EXPECT_EQ(cases[i].expected_previous, previous);
     EXPECT_TRUE(render_text->IsValidCursorIndex(previous));
   }
 }
 
-TEST_F(RenderTextTest, MidGraphemeSelectionBounds) {
+// TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
+TEST_P(RenderTextHarfBuzzTest, MidGraphemeSelectionBounds) {
 #if defined(OS_WIN)
   // TODO(msw): XP fails due to lack of font support: http://crbug.com/106450
   if (base::win::GetVersion() < base::win::VERSION_VISTA)
     return;
 #endif
 
   // Test that selection bounds may be set amid multi-character graphemes.
   const base::string16 kHindi = WideToUTF16(L"\x0915\x093f");
   const base::string16 kThai = WideToUTF16(L"\x0e08\x0e33");
   const base::string16 cases[] = { kHindi, kThai };
 
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  RenderText* render_text = GetRenderText();
   for (size_t i = 0; i < arraysize(cases); i++) {
     SCOPED_TRACE(base::StringPrintf("Testing cases[%" PRIuS "]", i));
     render_text->SetText(cases[i]);
     EXPECT_TRUE(render_text->IsValidLogicalIndex(1));
     EXPECT_FALSE(render_text->IsValidCursorIndex(1));
     EXPECT_TRUE(render_text->SelectRange(Range(2, 1)));
     EXPECT_EQ(Range(2, 1), render_text->selection());
     EXPECT_EQ(1U, render_text->cursor_position());
     // Although selection bounds may be set within a multi-character grapheme,
     // cursor movement (e.g. via arrow key) should avoid those indices.
     render_text->MoveCursor(CHARACTER_BREAK, CURSOR_LEFT, SELECTION_NONE);
     EXPECT_EQ(0U, render_text->cursor_position());
     render_text->MoveCursor(CHARACTER_BREAK, CURSOR_RIGHT, SELECTION_NONE);
     EXPECT_EQ(2U, render_text->cursor_position());
   }
 }
 
-TEST_F(RenderTextTest, FindCursorPosition) {
+// TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
+TEST_P(RenderTextHarfBuzzTest, FindCursorPosition) {
   const wchar_t* kTestStrings[] = { kLtrRtl, kLtrRtlLtr, kRtlLtr, kRtlLtrRtl };
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  RenderText* render_text = GetRenderText();
   render_text->SetDisplayRect(Rect(0, 0, 100, 20));
   for (size_t i = 0; i < arraysize(kTestStrings); ++i) {
     SCOPED_TRACE(base::StringPrintf("Testing case[%" PRIuS "]", i));
     render_text->SetText(WideToUTF16(kTestStrings[i]));
-    for(size_t j = 0; j < render_text->text().length(); ++j) {
+    for (size_t j = 0; j < render_text->text().length(); ++j) {
       const Range range(render_text->GetGlyphBounds(j));
       // Test a point just inside the leading edge of the glyph bounds.
       int x = range.is_reversed() ? range.GetMax() - 1 : range.GetMin() + 1;
       EXPECT_EQ(j, render_text->FindCursorPosition(Point(x, 0)).caret_pos());
     }
   }
 }
-#endif  // !defined(OS_MACOSX)
 
-TEST_F(RenderTextTest, EdgeSelectionModels) {
+TEST_P(RenderTextTest, EdgeSelectionModels) {
   // Simple Latin text.
   const base::string16 kLatin = WideToUTF16(L"abc");
   // LTR 2-character grapheme.
   const base::string16 kLTRGrapheme = WideToUTF16(L"\x0915\x093f");
   // LTR 2-character grapheme, LTR a, LTR 2-character grapheme.
   const base::string16 kHindiLatin =
       WideToUTF16(L"\x0915\x093f" L"a" L"\x0915\x093f");
   // RTL 2-character grapheme.
   const base::string16 kRTLGrapheme = WideToUTF16(L"\x05e0\x05b8");
   // RTL 2-character grapheme, LTR a, RTL 2-character grapheme.
@@ skipping 11 matching lines @@
     { kRTLGrapheme, base::i18n::RIGHT_TO_LEFT },
     { kHebrewLatin, base::i18n::RIGHT_TO_LEFT },
   };
 
 #if defined(OS_WIN)
   // TODO(msw): XP fails due to lack of font support: http://crbug.com/106450
   if (base::win::GetVersion() < base::win::VERSION_VISTA)
     return;
 #endif
 
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  RenderText* render_text = GetRenderText();
   for (size_t i = 0; i < arraysize(cases); i++) {
     render_text->SetText(cases[i].text);
     bool ltr = (cases[i].expected_text_direction == base::i18n::LEFT_TO_RIGHT);
 
     SelectionModel start_edge =
         render_text->EdgeSelectionModel(ltr ? CURSOR_LEFT : CURSOR_RIGHT);
     EXPECT_EQ(start_edge, SelectionModel(0, CURSOR_BACKWARD));
 
     SelectionModel end_edge =
         render_text->EdgeSelectionModel(ltr ? CURSOR_RIGHT : CURSOR_LEFT);
     EXPECT_EQ(end_edge, SelectionModel(cases[i].text.length(), CURSOR_FORWARD));
   }
 }
 
-TEST_F(RenderTextTest, SelectAll) {
+TEST_P(RenderTextTest, SelectAll) {
   const wchar_t* const cases[] =
       { kWeak, kLtr, kLtrRtl, kLtrRtlLtr, kRtl, kRtlLtr, kRtlLtrRtl };
 
   // Ensure that SelectAll respects the |reversed| argument regardless of
   // application locale and text content directionality.
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  RenderText* render_text = GetRenderText();
   const SelectionModel expected_reversed(Range(3, 0), CURSOR_FORWARD);
   const SelectionModel expected_forwards(Range(0, 3), CURSOR_BACKWARD);
   const bool was_rtl = base::i18n::IsRTL();
 
   for (size_t i = 0; i < 2; ++i) {
     SetRTL(!base::i18n::IsRTL());
     // Test that an empty string produces an empty selection model.
     render_text->SetText(base::string16());
     EXPECT_EQ(render_text->selection_model(), SelectionModel());
 
     // Test the weak, LTR, RTL, and Bidi string cases.
     for (size_t j = 0; j < arraysize(cases); j++) {
       render_text->SetText(WideToUTF16(cases[j]));
       render_text->SelectAll(false);
       EXPECT_EQ(render_text->selection_model(), expected_forwards);
       render_text->SelectAll(true);
       EXPECT_EQ(render_text->selection_model(), expected_reversed);
     }
   }
 
   EXPECT_EQ(was_rtl, base::i18n::IsRTL());
 }
 
 // TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
-#if !defined(OS_MACOSX)
-TEST_F(RenderTextTest, MoveCursorLeftRightWithSelection) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+TEST_P(RenderTextHarfBuzzTest, MoveCursorLeftRightWithSelection) {
+  RenderText* render_text = GetRenderText();
   render_text->SetText(WideToUTF16(L"abc\x05d0\x05d1\x05d2"));
   // Left arrow on select ranging (6, 4).
   render_text->MoveCursor(LINE_BREAK, CURSOR_RIGHT, SELECTION_NONE);
   EXPECT_EQ(Range(6), render_text->selection());
   render_text->MoveCursor(CHARACTER_BREAK, CURSOR_LEFT, SELECTION_NONE);
   EXPECT_EQ(Range(4), render_text->selection());
   render_text->MoveCursor(CHARACTER_BREAK, CURSOR_LEFT, SELECTION_NONE);
   EXPECT_EQ(Range(5), render_text->selection());
   render_text->MoveCursor(CHARACTER_BREAK, CURSOR_LEFT, SELECTION_NONE);
   EXPECT_EQ(Range(6), render_text->selection());
@@ skipping 17 matching lines @@
   EXPECT_EQ(Range(5), render_text->selection());
   render_text->MoveCursor(CHARACTER_BREAK, CURSOR_RIGHT, SELECTION_NONE);
   EXPECT_EQ(Range(4), render_text->selection());
   render_text->MoveCursor(CHARACTER_BREAK, CURSOR_LEFT, SELECTION_RETAIN);
   EXPECT_EQ(Range(4, 5), render_text->selection());
   render_text->MoveCursor(CHARACTER_BREAK, CURSOR_LEFT, SELECTION_RETAIN);
   EXPECT_EQ(Range(4, 6), render_text->selection());
   render_text->MoveCursor(CHARACTER_BREAK, CURSOR_RIGHT, SELECTION_NONE);
   EXPECT_EQ(Range(4), render_text->selection());
 }
-#endif  // !defined(OS_MACOSX)
 
-TEST_F(RenderTextTest, CenteredDisplayOffset) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+TEST_P(RenderTextTest, CenteredDisplayOffset) {
+  RenderText* render_text = GetRenderText();
   render_text->SetText(ASCIIToUTF16("abcdefghij"));
   render_text->SetHorizontalAlignment(ALIGN_CENTER);
 
   const int kEnlargement = 10;
   const int content_width = render_text->GetContentWidth();
   Rect display_rect(0, 0, content_width / 2,
                     render_text->font_list().GetHeight());
   render_text->SetDisplayRect(display_rect);
 
   // Move the cursor to the beginning of the text and, by checking the cursor
   // bounds, make sure no empty space is to the left of the text.
   render_text->SetCursorPosition(0);
   EXPECT_EQ(display_rect.x(), render_text->GetUpdatedCursorBounds().x());
 
   // Widen the display rect and, by checking the cursor bounds, make sure no
   // empty space is introduced to the left of the text.
   display_rect.Inset(0, 0, -kEnlargement, 0);
   render_text->SetDisplayRect(display_rect);
   EXPECT_EQ(display_rect.x(), render_text->GetUpdatedCursorBounds().x());
 
-// TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
-#if !defined(OS_MACOSX)
-  // Move the cursor to the end of the text and, by checking the cursor bounds,
-  // make sure no empty space is to the right of the text.
-  render_text->SetCursorPosition(render_text->text().length());
-  EXPECT_EQ(display_rect.right(),
-            render_text->GetUpdatedCursorBounds().right());
+  // TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
+  if (GetParam() != RENDER_TEXT_MAC) {
+    // Move the cursor to the end of the text and, by checking the cursor
+    // bounds, make sure no empty space is to the right of the text.
+    render_text->SetCursorPosition(render_text->text().length());
+    EXPECT_EQ(display_rect.right(),
+              render_text->GetUpdatedCursorBounds().right());
 
-  // Widen the display rect and, by checking the cursor bounds, make sure no
-  // empty space is introduced to the right of the text.
-  display_rect.Inset(0, 0, -kEnlargement, 0);
-  render_text->SetDisplayRect(display_rect);
-  EXPECT_EQ(display_rect.right(),
-            render_text->GetUpdatedCursorBounds().right());
-#endif  // !defined(OS_MACOSX)
+    // Widen the display rect and, by checking the cursor bounds, make sure no
+    // empty space is introduced to the right of the text.
+    display_rect.Inset(0, 0, -kEnlargement, 0);
+    render_text->SetDisplayRect(display_rect);
+    EXPECT_EQ(display_rect.right(),
+              render_text->GetUpdatedCursorBounds().right());
+  }
 }
 
 void MoveLeftRightByWordVerifier(RenderText* render_text,
                                  const wchar_t* str) {
   render_text->SetText(WideToUTF16(str));
 
   // Test moving by word from left ro right.
   render_text->MoveCursor(LINE_BREAK, CURSOR_LEFT, SELECTION_NONE);
   bool first_word = true;
   while (true) {
@@ skipping 45 matching lines @@
       render_text->MoveCursorTo(start);
       for (int k = 0; k < j; ++k)
         render_text->MoveCursor(CHARACTER_BREAK, CURSOR_LEFT, SELECTION_NONE);
       render_text->MoveCursor(WORD_BREAK, CURSOR_LEFT, SELECTION_NONE);
       EXPECT_EQ(end, render_text->selection_model());
     }
   }
 }
 
 // TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
-#if !defined(OS_MACOSX)
-// TODO(msw): Make these work on Windows.
+// TODO(msw): Make these work on Windows. http://crbug.com/196326
 #if !defined(OS_WIN)
-TEST_F(RenderTextTest, MoveLeftRightByWordInBidiText) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
-
+TEST_P(RenderTextHarfBuzzTest, MoveLeftRightByWordInBidiText) {
+  RenderText* render_text = GetRenderText();
   // For testing simplicity, each word is a 3-character word.
   std::vector<const wchar_t*> test;
   test.push_back(L"abc");
   test.push_back(L"abc def");
   test.push_back(L"\x05E1\x05E2\x05E3");
   test.push_back(L"\x05E1\x05E2\x05E3 \x05E4\x05E5\x05E6");
   test.push_back(L"abc \x05E1\x05E2\x05E3");
   test.push_back(L"abc def \x05E1\x05E2\x05E3 \x05E4\x05E5\x05E6");
   test.push_back(L"abc def hij \x05E1\x05E2\x05E3 \x05E4\x05E5\x05E6"
                  L" \x05E7\x05E8\x05E9");
 
   test.push_back(L"abc \x05E1\x05E2\x05E3 hij");
   test.push_back(L"abc def \x05E1\x05E2\x05E3 \x05E4\x05E5\x05E6 hij opq");
   test.push_back(L"abc def hij \x05E1\x05E2\x05E3 \x05E4\x05E5\x05E6"
                  L" \x05E7\x05E8\x05E9" L" opq rst uvw");
 
   test.push_back(L"\x05E1\x05E2\x05E3 abc");
   test.push_back(L"\x05E1\x05E2\x05E3 \x05E4\x05E5\x05E6 abc def");
   test.push_back(L"\x05E1\x05E2\x05E3 \x05E4\x05E5\x05E6 \x05E7\x05E8\x05E9"
                  L" abc def hij");
 
   test.push_back(L"\x05D1\x05D2\x05D3 abc \x05E1\x05E2\x05E3");
   test.push_back(L"\x05D1\x05D2\x05D3 \x05D4\x05D5\x05D6 abc def"
                  L" \x05E1\x05E2\x05E3 \x05E4\x05E5\x05E6");
   test.push_back(L"\x05D1\x05D2\x05D3 \x05D4\x05D5\x05D6 \x05D7\x05D8\x05D9"
                  L" abc def hij \x05E1\x05E2\x05E3 \x05E4\x05E5\x05E6"
                  L" \x05E7\x05E8\x05E9");
 
   for (size_t i = 0; i < test.size(); ++i)
-    MoveLeftRightByWordVerifier(render_text.get(), test[i]);
+    MoveLeftRightByWordVerifier(render_text, test[i]);
 }
 
-TEST_F(RenderTextTest, MoveLeftRightByWordInBidiText_TestEndOfText) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+// TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
+TEST_P(RenderTextHarfBuzzTest, MoveLeftRightByWordInBidiText_TestEndOfText) {
+  RenderText* render_text = GetRenderText();
 
   render_text->SetText(WideToUTF16(L"ab\x05E1"));
   // Moving the cursor by word from "abC|" to the left should return "|abC".
   // But since end of text is always treated as a word break, it returns
   // position "ab|C".
   // TODO(xji): Need to make it work as expected.
   render_text->MoveCursor(LINE_BREAK, CURSOR_RIGHT, SELECTION_NONE);
   render_text->MoveCursor(WORD_BREAK, CURSOR_LEFT, SELECTION_NONE);
   // EXPECT_EQ(SelectionModel(), render_text->selection_model());
 
@@ skipping 11 matching lines @@
 
   // Moving the cursor by word from "|aCB" to the right should return "aCB|".
   // But since end of text is always treated as a word break, it returns
   // position "a|CB".
   // TODO(xji): Need to make it work as expected.
   render_text->MoveCursor(LINE_BREAK, CURSOR_LEFT, SELECTION_NONE);
   render_text->MoveCursor(WORD_BREAK, CURSOR_RIGHT, SELECTION_NONE);
   // EXPECT_EQ(SelectionModel(), render_text->selection_model());
 }
 
-TEST_F(RenderTextTest, MoveLeftRightByWordInTextWithMultiSpaces) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+// TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
+TEST_P(RenderTextHarfBuzzTest, MoveLeftRightByWordInTextWithMultiSpaces) {
+  RenderText* render_text = GetRenderText();
   render_text->SetText(WideToUTF16(L"abc     def"));
   render_text->MoveCursorTo(SelectionModel(5, CURSOR_FORWARD));
   render_text->MoveCursor(WORD_BREAK, CURSOR_RIGHT, SELECTION_NONE);
   EXPECT_EQ(11U, render_text->cursor_position());
 
   render_text->MoveCursorTo(SelectionModel(5, CURSOR_FORWARD));
   render_text->MoveCursor(WORD_BREAK, CURSOR_LEFT, SELECTION_NONE);
   EXPECT_EQ(0U, render_text->cursor_position());
 }
 #endif  // !defined(OS_WIN)
 
-TEST_F(RenderTextTest, MoveLeftRightByWordInChineseText) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+// TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
+TEST_P(RenderTextHarfBuzzTest, MoveLeftRightByWordInChineseText) {
+  RenderText* render_text = GetRenderText();
   render_text->SetText(WideToUTF16(L"\x6211\x4EEC\x53BB\x516C\x56ED\x73A9"));
   render_text->MoveCursor(LINE_BREAK, CURSOR_LEFT, SELECTION_NONE);
   EXPECT_EQ(0U, render_text->cursor_position());
   render_text->MoveCursor(WORD_BREAK, CURSOR_RIGHT, SELECTION_NONE);
   EXPECT_EQ(2U, render_text->cursor_position());
   render_text->MoveCursor(WORD_BREAK, CURSOR_RIGHT, SELECTION_NONE);
   EXPECT_EQ(3U, render_text->cursor_position());
   render_text->MoveCursor(WORD_BREAK, CURSOR_RIGHT, SELECTION_NONE);
   EXPECT_EQ(5U, render_text->cursor_position());
   render_text->MoveCursor(WORD_BREAK, CURSOR_RIGHT, SELECTION_NONE);
   EXPECT_EQ(6U, render_text->cursor_position());
   render_text->MoveCursor(WORD_BREAK, CURSOR_RIGHT, SELECTION_NONE);
   EXPECT_EQ(6U, render_text->cursor_position());
 }
-#endif  // !defined(OS_MACOSX)
 
-TEST_F(RenderTextTest, StringSizeSanity) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+TEST_P(RenderTextTest, StringSizeSanity) {
+  RenderText* render_text = GetRenderText();
   render_text->SetText(UTF8ToUTF16("Hello World"));
   const Size string_size = render_text->GetStringSize();
   EXPECT_GT(string_size.width(), 0);
   EXPECT_GT(string_size.height(), 0);
 }
 
-TEST_F(RenderTextTest, StringSizeLongStrings) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+TEST_P(RenderTextTest, StringSizeLongStrings) {
+  RenderText* render_text = GetRenderText();
   Size previous_string_size;
   for (size_t length = 10; length < 1000000; length *= 10) {
     render_text->SetText(base::string16(length, 'a'));
     const Size string_size = render_text->GetStringSize();
     EXPECT_GT(string_size.width(), previous_string_size.width());
     EXPECT_GT(string_size.height(), 0);
     previous_string_size = string_size;
   }
 }
 
-// TODO(asvitkine): This test fails because PlatformFontMac uses point font
-//                  sizes instead of pixel sizes like other implementations.
-#if !defined(OS_MACOSX)
-TEST_F(RenderTextTest, StringSizeEmptyString) {
+TEST_P(RenderTextTest, StringSizeEmptyString) {
   // Ascent and descent of Arial and Symbol are different on most platforms.
   const FontList font_list("Arial,Symbol, 16px");
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  RenderText* render_text = GetRenderText();
   render_text->SetFontList(font_list);
   render_text->SetDisplayRect(Rect(0, 0, 0, font_list.GetHeight()));
 
   // The empty string respects FontList metrics for non-zero height
   // and baseline.
   render_text->SetText(base::string16());
   EXPECT_EQ(font_list.GetHeight(), render_text->GetStringSize().height());
   EXPECT_EQ(0, render_text->GetStringSize().width());
   EXPECT_EQ(font_list.GetBaseline(), render_text->GetBaseline());
 
   render_text->SetText(UTF8ToUTF16(" "));
   EXPECT_EQ(font_list.GetHeight(), render_text->GetStringSize().height());
   EXPECT_EQ(font_list.GetBaseline(), render_text->GetBaseline());
 }
-#endif  // !defined(OS_MACOSX)
 
-TEST_F(RenderTextTest, StringSizeRespectsFontListMetrics) {
+TEST_P(RenderTextTest, StringSizeRespectsFontListMetrics) {
   // Check that Arial and Symbol have different font metrics.
   Font arial_font("Arial", 16);
   ASSERT_EQ("arial",
             base::ToLowerASCII(arial_font.GetActualFontNameForTesting()));
   Font symbol_font("Symbol", 16);
   ASSERT_EQ("symbol",
             base::ToLowerASCII(symbol_font.GetActualFontNameForTesting()));
   EXPECT_NE(arial_font.GetHeight(), symbol_font.GetHeight());
   EXPECT_NE(arial_font.GetBaseline(), symbol_font.GetBaseline());
   // "a" should be rendered with Arial, not with Symbol.
   const char* arial_font_text = "a";
   // "®" (registered trademark symbol) should be rendered with Symbol,
   // not with Arial.
   const char* symbol_font_text = "\xC2\xAE";
 
   Font smaller_font = arial_font;
   Font larger_font = symbol_font;
   const char* smaller_font_text = arial_font_text;
   const char* larger_font_text = symbol_font_text;
   if (symbol_font.GetHeight() < arial_font.GetHeight() &&
       symbol_font.GetBaseline() < arial_font.GetBaseline()) {
     std::swap(smaller_font, larger_font);
     std::swap(smaller_font_text, larger_font_text);
   }
   ASSERT_LT(smaller_font.GetHeight(), larger_font.GetHeight());
   ASSERT_LT(smaller_font.GetBaseline(), larger_font.GetBaseline());
 
   // Check |smaller_font_text| is rendered with the smaller font.
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  RenderText* render_text = GetRenderText();
   render_text->SetText(UTF8ToUTF16(smaller_font_text));
   render_text->SetFontList(FontList(smaller_font));
   render_text->SetDisplayRect(Rect(0, 0, 0,
                                    render_text->font_list().GetHeight()));
   EXPECT_EQ(smaller_font.GetHeight(), render_text->GetStringSize().height());
   EXPECT_EQ(smaller_font.GetBaseline(), render_text->GetBaseline());
 
   // Layout the same text with mixed fonts.  The text should be rendered with
   // the smaller font, but the height and baseline are determined with the
   // metrics of the font list, which is equal to the larger font.
   std::vector<Font> fonts;
   fonts.push_back(smaller_font);  // The primary font is the smaller font.
   fonts.push_back(larger_font);
   const FontList font_list(fonts);
   render_text->SetFontList(font_list);
   render_text->SetDisplayRect(Rect(0, 0, 0,
                                    render_text->font_list().GetHeight()));
   EXPECT_LT(smaller_font.GetHeight(), render_text->GetStringSize().height());
   EXPECT_LT(smaller_font.GetBaseline(), render_text->GetBaseline());
   EXPECT_EQ(font_list.GetHeight(), render_text->GetStringSize().height());
   EXPECT_EQ(font_list.GetBaseline(), render_text->GetBaseline());
 }
 
-TEST_F(RenderTextTest, MinLineHeight) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
-
+TEST_P(RenderTextTest, MinLineHeight) {
+  RenderText* render_text = GetRenderText();
   render_text->SetText(ASCIIToUTF16("Hello!"));
   SizeF default_size = render_text->GetStringSizeF();
   ASSERT_NE(0, default_size.height());
   ASSERT_NE(0, default_size.width());
 
   render_text->SetMinLineHeight(default_size.height() / 2);
   EXPECT_EQ(default_size.ToString(), render_text->GetStringSizeF().ToString());
 
   render_text->SetMinLineHeight(default_size.height() * 2);
   SizeF taller_size = render_text->GetStringSizeF();
   EXPECT_EQ(default_size.height() * 2, taller_size.height());
   EXPECT_EQ(default_size.width(), taller_size.width());
 }
 
-TEST_F(RenderTextTest, SetFontList) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+TEST_P(RenderTextTest, SetFontList) {
+  RenderText* render_text = GetRenderText();
   render_text->SetFontList(FontList("Arial,Symbol, 13px"));
   const std::vector<Font>& fonts = render_text->font_list().GetFonts();
   ASSERT_EQ(2U, fonts.size());
   EXPECT_EQ("Arial", fonts[0].GetFontName());
   EXPECT_EQ("Symbol", fonts[1].GetFontName());
   EXPECT_EQ(13, render_text->font_list().GetFontSize());
 }
 
 // http://crbug/624513
-#if defined(OS_WIN)
-#define MAYBE_StringSizeBoldWidth DISABLED_StringSizeBoldWidth
-#else
-#define MAYBE_StringSizeBoldWidth StringSizeBoldWidth
-#endif
-TEST_F(RenderTextTest, MAYBE_StringSizeBoldWidth) {
+#if !defined(OS_WIN)
+TEST_P(RenderTextTest, StringSizeBoldWidth) {
   // TODO(mboc): Add some unittests for other weights (currently not
   // implemented because of test system font configuration).
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  RenderText* render_text = GetRenderText();
   render_text->SetText(UTF8ToUTF16("Hello World"));
 
   const int plain_width = render_text->GetStringSize().width();
   EXPECT_GT(plain_width, 0);
 
   // Apply a bold style and check that the new width is greater.
   render_text->SetWeight(Font::Weight::BOLD);
   const int bold_width = render_text->GetStringSize().width();
   EXPECT_GT(bold_width, plain_width);
 
 #if defined(OS_WIN)
   render_text->SetWeight(Font::Weight::SEMIBOLD);
   const int semibold_width = render_text->GetStringSize().width();
   EXPECT_GT(bold_width, semibold_width);
 #endif
 
   // Now, apply a plain style over the first word only.
   render_text->ApplyWeight(Font::Weight::NORMAL, Range(0, 5));
   const int plain_bold_width = render_text->GetStringSize().width();
   EXPECT_GT(plain_bold_width, plain_width);
   EXPECT_LT(plain_bold_width, bold_width);
 }
+#endif  // !defined(OS_WIN)
 
-TEST_F(RenderTextTest, StringSizeHeight) {
+TEST_P(RenderTextTest, StringSizeHeight) {
   base::string16 cases[] = {
     WideToUTF16(L"Hello World!"),  // English
     WideToUTF16(L"\x6328\x62f6"),  // Japanese
     WideToUTF16(L"\x0915\x093f"),  // Hindi
     WideToUTF16(L"\x05e0\x05b8"),  // Hebrew
   };
 
   const FontList default_font_list;
   const FontList& larger_font_list = default_font_list.DeriveWithSizeDelta(24);
   EXPECT_GT(larger_font_list.GetHeight(), default_font_list.GetHeight());
 
   for (size_t i = 0; i < arraysize(cases); i++) {
-    std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+    ResetRenderTextInstance();
+    RenderText* render_text = GetRenderText();
     render_text->SetFontList(default_font_list);
     render_text->SetText(cases[i]);
 
     const int height1 = render_text->GetStringSize().height();
     EXPECT_GT(height1, 0);
 
     // Check that setting the larger font increases the height.
     render_text->SetFontList(larger_font_list);
     const int height2 = render_text->GetStringSize().height();
     EXPECT_GT(height2, height1);
   }
 }
 
-TEST_F(RenderTextTest, GetBaselineSanity) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+TEST_P(RenderTextTest, GetBaselineSanity) {
+  RenderText* render_text = GetRenderText();
   render_text->SetText(UTF8ToUTF16("Hello World"));
   const int baseline = render_text->GetBaseline();
   EXPECT_GT(baseline, 0);
 }
 
-TEST_F(RenderTextTest, CursorBoundsInReplacementMode) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+TEST_P(RenderTextTest, CursorBoundsInReplacementMode) {
+  RenderText* render_text = GetRenderText();
   render_text->SetText(ASCIIToUTF16("abcdefg"));
   render_text->SetDisplayRect(Rect(100, 17));
   SelectionModel sel_b(1, CURSOR_FORWARD);
   SelectionModel sel_c(2, CURSOR_FORWARD);
   Rect cursor_around_b = render_text->GetCursorBounds(sel_b, false);
   Rect cursor_before_b = render_text->GetCursorBounds(sel_b, true);
   Rect cursor_before_c = render_text->GetCursorBounds(sel_c, true);
   EXPECT_EQ(cursor_around_b.x(), cursor_before_b.x());
   EXPECT_EQ(cursor_around_b.right(), cursor_before_c.x());
 }
 
-TEST_F(RenderTextTest, GetTextOffset) {
+TEST_P(RenderTextTest, GetTextOffset) {
   // The default horizontal text offset differs for LTR and RTL, and is only set
   // when the RenderText object is created.  This test will check the default in
   // LTR mode, and the next test will check the RTL default.
   const bool was_rtl = base::i18n::IsRTL();
   SetRTL(false);
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+
+  // Reset the render text instance since the locale was changed.
+  ResetRenderTextInstance();
+  RenderText* render_text = GetRenderText();
+
   render_text->SetText(ASCIIToUTF16("abcdefg"));
   render_text->SetFontList(FontList("Arial, 13px"));
 
   // Set display area's size equal to the font size.
   const Size font_size(render_text->GetContentWidth(),
                        render_text->font_list().GetHeight());
   Rect display_rect(font_size);
   render_text->SetDisplayRect(display_rect);
 
   Vector2d offset = render_text->GetLineOffset(0);
@@ skipping 24 matching lines @@
   render_text->SetDisplayRect(display_rect);
   const Vector2d prev_offset = render_text->GetLineOffset(0);
   display_rect.Inset(0, 0, 0, -2 * kEnlargementY);
   render_text->SetDisplayRect(display_rect);
   offset = render_text->GetLineOffset(0);
   EXPECT_EQ(prev_offset.y() + kEnlargementY, offset.y());
 
   SetRTL(was_rtl);
 }
 
-TEST_F(RenderTextTest, GetTextOffsetHorizontalDefaultInRTL) {
+TEST_P(RenderTextTest, GetTextOffsetHorizontalDefaultInRTL) {
   // This only checks the default horizontal alignment in RTL mode; all other
   // GetLineOffset(0) attributes are checked by the test above.
   const bool was_rtl = base::i18n::IsRTL();
   SetRTL(true);
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+
+  // Reset the render text instance since the locale was changed.
+  ResetRenderTextInstance();
+  RenderText* render_text = GetRenderText();
+
   render_text->SetText(ASCIIToUTF16("abcdefg"));
   render_text->SetFontList(FontList("Arial, 13px"));
   const int kEnlargement = 2;
   const Size font_size(render_text->GetContentWidth() + kEnlargement,
                        render_text->GetStringSize().height());
   Rect display_rect(font_size);
   render_text->SetDisplayRect(display_rect);
   Vector2d offset = render_text->GetLineOffset(0);
   EXPECT_EQ(kEnlargement, offset.x());
   SetRTL(was_rtl);
 }
 
-TEST_F(RenderTextTest, SetDisplayOffset) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+TEST_P(RenderTextTest, SetDisplayOffset) {
+  RenderText* render_text = GetRenderText();
   render_text->SetText(ASCIIToUTF16("abcdefg"));
   render_text->SetFontList(FontList("Arial, 13px"));
 
   const Size font_size(render_text->GetContentWidth(),
                        render_text->font_list().GetHeight());
   const int kEnlargement = 10;
 
   // Set display width |kEnlargement| pixels greater than content width and test
   // different possible situations. In this case the only possible display
   // offset is zero.
@@ skipping 52 matching lines @@
   };
 
   for (size_t i = 0; i < arraysize(large_content_cases); i++) {
     render_text->SetHorizontalAlignment(large_content_cases[i].alignment);
     render_text->SetDisplayOffset(large_content_cases[i].offset);
     EXPECT_EQ(large_content_cases[i].expected_offset,
               render_text->GetUpdatedDisplayOffset().x());
   }
 }
 
-TEST_F(RenderTextTest, SameFontForParentheses) {
+TEST_P(RenderTextTest, SameFontForParentheses) {
   struct {
     const base::char16 left_char;
     const base::char16 right_char;
   } punctuation_pairs[] = {
     { '(', ')' },
     { '{', '}' },
     { '<', '>' },
   };
   struct {
     base::string16 text;
@@ skipping 18 matching lines @@
     { WideToUTF16(L"Hello World(\x0915\x093f)Hello World") },
 
     // Hebrew(English)
     { WideToUTF16(L"\x05e0\x05b8(a)") },
     // Hebrew(English)Hebrew
     { WideToUTF16(L"\x05e0\x05b8(a)\x05e0\x05b8") },
     // English(Hebrew)English
     { WideToUTF16(L"Hello World(\x05e0\x05b8)Hello World") },
   };
 
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  RenderText* render_text = GetRenderText();
   for (size_t i = 0; i < arraysize(cases); ++i) {
     base::string16 text = cases[i].text;
     const size_t start_paren_char_index = text.find('(');
     ASSERT_NE(base::string16::npos, start_paren_char_index);
     const size_t end_paren_char_index = text.find(')');
     ASSERT_NE(base::string16::npos, end_paren_char_index);
 
     for (size_t j = 0; j < arraysize(punctuation_pairs); ++j) {
       text[start_paren_char_index] = punctuation_pairs[j].left_char;
       text[end_paren_char_index] = punctuation_pairs[j].right_char;
@@ skipping 17 matching lines @@
       const Font& end_font = spans[end_paren_span_index].first;
       EXPECT_EQ(start_font.GetFontName(), end_font.GetFontName());
       EXPECT_EQ(start_font.GetFontSize(), end_font.GetFontSize());
       EXPECT_EQ(start_font.GetStyle(), end_font.GetStyle());
     }
   }
 }
 
 // Make sure the caret width is always >=1 so that the correct
 // caret is drawn at high DPI. crbug.com/164100.
-TEST_F(RenderTextTest, CaretWidth) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+TEST_P(RenderTextTest, CaretWidth) {
+  RenderText* render_text = GetRenderText();
   render_text->SetText(ASCIIToUTF16("abcdefg"));
   EXPECT_GE(render_text->GetUpdatedCursorBounds().width(), 1);
 }
 
-TEST_F(RenderTextTest, SelectWord) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+TEST_P(RenderTextTest, SelectWord) {
+  RenderText* render_text = GetRenderText();
   render_text->SetText(ASCIIToUTF16(" foo  a.bc.d bar"));
 
   struct {
     size_t cursor;
     size_t selection_start;
     size_t selection_end;
   } cases[] = {
     { 0,   0,  1 },
     { 1,   1,  4 },
     { 2,   1,  4 },
@@ skipping 15 matching lines @@
 
   for (size_t i = 0; i < arraysize(cases); ++i) {
     render_text->SetCursorPosition(cases[i].cursor);
     render_text->SelectWord();
     EXPECT_EQ(Range(cases[i].selection_start, cases[i].selection_end),
               render_text->selection());
   }
 }
 
 // Make sure the last word is selected when the cursor is at text.length().
-TEST_F(RenderTextTest, LastWordSelected) {
+TEST_P(RenderTextTest, LastWordSelected) {
   const std::string kTestURL1 = "http://www.google.com";
   const std::string kTestURL2 = "http://www.google.com/something/";
 
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  RenderText* render_text = GetRenderText();
 
   render_text->SetText(ASCIIToUTF16(kTestURL1));
   render_text->SetCursorPosition(kTestURL1.length());
   render_text->SelectWord();
-  EXPECT_EQ(ASCIIToUTF16("com"), GetSelectedText(render_text.get()));
+  EXPECT_EQ(ASCIIToUTF16("com"), GetSelectedText(render_text));
   EXPECT_FALSE(render_text->selection().is_reversed());
 
   render_text->SetText(ASCIIToUTF16(kTestURL2));
   render_text->SetCursorPosition(kTestURL2.length());
   render_text->SelectWord();
-  EXPECT_EQ(ASCIIToUTF16("/"), GetSelectedText(render_text.get()));
+  EXPECT_EQ(ASCIIToUTF16("/"), GetSelectedText(render_text));
   EXPECT_FALSE(render_text->selection().is_reversed());
 }
 
 // When given a non-empty selection, SelectWord should expand the selection to
 // nearest word boundaries.
-TEST_F(RenderTextTest, SelectMultipleWords) {
+TEST_P(RenderTextTest, SelectMultipleWords) {
   const std::string kTestURL = "http://www.google.com";
 
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  RenderText* render_text = GetRenderText();
 
   render_text->SetText(ASCIIToUTF16(kTestURL));
   render_text->SelectRange(Range(16, 20));
   render_text->SelectWord();
-  EXPECT_EQ(ASCIIToUTF16("google.com"), GetSelectedText(render_text.get()));
+  EXPECT_EQ(ASCIIToUTF16("google.com"), GetSelectedText(render_text));
   EXPECT_FALSE(render_text->selection().is_reversed());
 
   // SelectWord should preserve the selection direction.
   render_text->SelectRange(Range(20, 16));
   render_text->SelectWord();
-  EXPECT_EQ(ASCIIToUTF16("google.com"), GetSelectedText(render_text.get()));
+  EXPECT_EQ(ASCIIToUTF16("google.com"), GetSelectedText(render_text));
   EXPECT_TRUE(render_text->selection().is_reversed());
 }
 
 // TODO(asvitkine): RenderTextMac cursor movements. http://crbug.com/131618
-#if !defined(OS_MACOSX)
-TEST_F(RenderTextTest, DisplayRectShowsCursorLTR) {
+TEST_P(RenderTextHarfBuzzTest, DisplayRectShowsCursorLTR) {
   ASSERT_FALSE(base::i18n::IsRTL());
   ASSERT_FALSE(base::i18n::ICUIsRTL());
 
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  RenderText* render_text = GetRenderText();
   render_text->SetText(WideToUTF16(L"abcdefghijklmnopqrstuvwxzyabcdefg"));
   render_text->MoveCursorTo(SelectionModel(render_text->text().length(),
                                            CURSOR_FORWARD));
   int width = render_text->GetStringSize().width();
   ASSERT_GT(width, 10);
 
   // Ensure that the cursor is placed at the width of its preceding text.
   render_text->SetDisplayRect(Rect(width + 10, 1));
   EXPECT_EQ(width, render_text->GetUpdatedCursorBounds().x());
 
@@ skipping 29 matching lines @@
 
   // Ensure that the text will pan to fill its expanding display rectangle.
   render_text->SetDisplayRect(Rect(width - 5, 1));
   EXPECT_EQ(render_text->display_rect().width(),
             render_text->GetUpdatedCursorBounds().right());
 
   // Ensure that a sufficiently large display rectangle shows all the text.
   render_text->SetDisplayRect(Rect(width + 10, 1));
   EXPECT_EQ(width, render_text->GetUpdatedCursorBounds().x());
 }
-#endif  // !defined(OS_MACOSX)
 
-TEST_F(RenderTextTest, DisplayRectShowsCursorRTL) {
+TEST_P(RenderTextTest, DisplayRectShowsCursorRTL) {
   // Set the application default text direction to RTL.
   const bool was_rtl = base::i18n::IsRTL();
   SetRTL(true);
 
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  // Reset the render text instance since the locale was changed.
+  ResetRenderTextInstance();
+  RenderText* render_text = GetRenderText();
   render_text->SetText(WideToUTF16(L"abcdefghijklmnopqrstuvwxzyabcdefg"));
   render_text->MoveCursorTo(SelectionModel(0, CURSOR_FORWARD));
   int width = render_text->GetStringSize().width();
   ASSERT_GT(width, 10);
 
   // Ensure that the cursor is placed at the width of its preceding text.
   render_text->SetDisplayRect(Rect(width + 10, 1));
   EXPECT_EQ(render_text->display_rect().width() - width - 1,
             render_text->GetUpdatedCursorBounds().x());
 
@@ skipping 35 matching lines @@
   render_text->SetDisplayRect(Rect(width + 10, 1));
   EXPECT_EQ(render_text->display_rect().width() - width - 1,
             render_text->GetUpdatedCursorBounds().x());
 
   // Reset the application default text direction to LTR.
   SetRTL(was_rtl);
   EXPECT_EQ(was_rtl, base::i18n::IsRTL());
 }
 
 // Changing colors between or inside ligated glyphs should not break shaping.
-TEST_F(RenderTextTest, SelectionKeepsLigatures) {
+TEST_P(RenderTextTest, SelectionKeepsLigatures) {
   const wchar_t* kTestStrings[] = { L"\x644\x623", L"\x633\x627" };
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  RenderText* render_text = GetRenderText();
   render_text->set_selection_color(SK_ColorRED);
-  Canvas canvas;
 
   for (size_t i = 0; i < arraysize(kTestStrings); ++i) {
     render_text->SetText(WideToUTF16(kTestStrings[i]));
     const int expected_width = render_text->GetStringSize().width();
     render_text->MoveCursorTo(SelectionModel(Range(0, 1), CURSOR_FORWARD));
     EXPECT_EQ(expected_width, render_text->GetStringSize().width());
     // Drawing the text should not DCHECK or crash; see http://crbug.com/262119
-    render_text->Draw(&canvas);
+    render_text->Draw(canvas());
     render_text->MoveCursorTo(SelectionModel(0, CURSOR_FORWARD));
   }
 }
 
 // Ensure strings wrap onto multiple lines for a small available width.
-TEST_F(RenderTextTest, Multiline_MinWidth) {
+TEST_P(RenderTextHarfBuzzTest, Multiline_MinWidth) {
   const wchar_t* kTestStrings[] = { kWeak, kLtr, kLtrRtl, kLtrRtlLtr, kRtl,
                                     kRtlLtr, kRtlLtrRtl };
 
-  RenderTextHarfBuzz render_text;
-  render_text.SetDisplayRect(Rect(1, 1000));
-  render_text.SetMultiline(true);
-  render_text.SetWordWrapBehavior(WRAP_LONG_WORDS);
-  Canvas canvas;
+  RenderText* render_text = GetRenderText();
+  render_text->SetDisplayRect(Rect(1, 1000));
+  render_text->SetMultiline(true);
+  render_text->SetWordWrapBehavior(WRAP_LONG_WORDS);
 
   for (size_t i = 0; i < arraysize(kTestStrings); ++i) {
     SCOPED_TRACE(base::StringPrintf("kTestStrings[%" PRIuS "]", i));
-    render_text.SetText(WideToUTF16(kTestStrings[i]));
-    render_text.Draw(&canvas);
-    EXPECT_GT(render_text.lines_.size(), 1U);
+    render_text->SetText(WideToUTF16(kTestStrings[i]));
+    render_text->Draw(canvas());
+    EXPECT_GT(render_text->lines_.size(), 1U);
   }
 }
 
 // Ensure strings wrap onto multiple lines for a normal available width.
-TEST_F(RenderTextTest, Multiline_NormalWidth) {
+TEST_P(RenderTextHarfBuzzTest, Multiline_NormalWidth) {
   const struct {
     const wchar_t* const text;
     const Range first_line_char_range;
     const Range second_line_char_range;
     bool is_ltr;
   } kTestStrings[] = {
     { L"abc defg hijkl", Range(0, 9), Range(9, 14), true },
     { L"qwertyzxcvbn", Range(0, 10), Range(10, 12), true },
     { L"\x0627\x0644\x0644\x063A\x0629 "
       L"\x0627\x0644\x0639\x0631\x0628\x064A\x0629",
       Range(0, 6), Range(6, 13), false },
     { L"\x062A\x0641\x0627\x062D \x05EA\x05E4\x05D5\x05D6\x05D9"
       L"\x05DA\x05DB\x05DD", Range(0, 5), Range(5, 13), false }
   };
 
-  RenderTextHarfBuzz render_text;
+  RenderTextHarfBuzz* render_text = GetRenderTextHarfBuzz();
+
   // Specify the fixed width for characters to suppress the possible variations
   // of linebreak results.
-  render_text.set_glyph_width_for_test(5);
-  render_text.SetDisplayRect(Rect(50, 1000));
-  render_text.SetMultiline(true);
-  render_text.SetWordWrapBehavior(WRAP_LONG_WORDS);
-  render_text.SetHorizontalAlignment(ALIGN_TO_HEAD);
-
-  Canvas canvas;
-  TestSkiaTextRenderer renderer(&canvas);
+  render_text->set_glyph_width_for_test(5);
+  render_text->SetDisplayRect(Rect(50, 1000));
+  render_text->SetMultiline(true);
+  render_text->SetWordWrapBehavior(WRAP_LONG_WORDS);
+  render_text->SetHorizontalAlignment(ALIGN_TO_HEAD);
 
   for (size_t i = 0; i < arraysize(kTestStrings); ++i) {
     SCOPED_TRACE(base::StringPrintf("kTestStrings[%" PRIuS "]", i));
-    render_text.SetText(WideToUTF16(kTestStrings[i].text));
-    render_text.EnsureLayout();
-    render_text.DrawVisualText(&renderer);
+    render_text->SetText(WideToUTF16(kTestStrings[i].text));
+    DrawVisualText();
 
-    ASSERT_EQ(2U, render_text.lines_.size());
-    ASSERT_EQ(1U, render_text.lines_[0].segments.size());
+    ASSERT_EQ(2U, render_text->lines_.size());
+    ASSERT_EQ(1U, render_text->lines_[0].segments.size());
     EXPECT_EQ(kTestStrings[i].first_line_char_range,
-              render_text.lines_[0].segments[0].char_range);
-    ASSERT_EQ(1U, render_text.lines_[1].segments.size());
+              render_text->lines_[0].segments[0].char_range);
+    ASSERT_EQ(1U, render_text->lines_[1].segments.size());
     EXPECT_EQ(kTestStrings[i].second_line_char_range,
-              render_text.lines_[1].segments[0].char_range);
+              render_text->lines_[1].segments[0].char_range);
 
     std::vector<TestSkiaTextRenderer::TextLog> text_log;
-    renderer.GetTextLogAndReset(&text_log);
+    renderer()->GetTextLogAndReset(&text_log);
     ASSERT_EQ(2U, text_log.size());
     // NOTE: this expectation compares the character length and glyph counts,
     // which isn't always equal. This is okay only because all the test
     // strings are simple (like, no compound characters nor UTF16-surrogate
     // pairs). Be careful in case more complicated test strings are added.
     EXPECT_EQ(kTestStrings[i].first_line_char_range.length(),
               text_log[0].glyph_count);
     EXPECT_EQ(kTestStrings[i].second_line_char_range.length(),
               text_log[1].glyph_count);
     EXPECT_LT(text_log[0].origin.y(), text_log[1].origin.y());
     if (kTestStrings[i].is_ltr) {
       EXPECT_EQ(0, text_log[0].origin.x());
       EXPECT_EQ(0, text_log[1].origin.x());
     } else {
       EXPECT_LT(0, text_log[0].origin.x());
       EXPECT_LT(0, text_log[1].origin.x());
     }
   }
 }
 
 // Ensure strings don't wrap onto multiple lines for a sufficient available
 // width.
-TEST_F(RenderTextTest, Multiline_SufficientWidth) {
+TEST_P(RenderTextHarfBuzzTest, Multiline_SufficientWidth) {
   const wchar_t* kTestStrings[] = { L"", L" ", L".", L" . ", L"abc", L"a b c",
                                     L"\x62E\x628\x632", L"\x62E \x628 \x632" };
 
-  RenderTextHarfBuzz render_text;
-  render_text.SetDisplayRect(Rect(1000, 1000));
-  render_text.SetMultiline(true);
-  Canvas canvas;
+  RenderText* render_text = GetRenderText();
+  render_text->SetDisplayRect(Rect(1000, 1000));
+  render_text->SetMultiline(true);
 
   for (size_t i = 0; i < arraysize(kTestStrings); ++i) {
     SCOPED_TRACE(base::StringPrintf("kTestStrings[%" PRIuS "]", i));
-    render_text.SetText(WideToUTF16(kTestStrings[i]));
-    render_text.Draw(&canvas);
-    EXPECT_EQ(1U, render_text.lines_.size());
+    render_text->SetText(WideToUTF16(kTestStrings[i]));
+    render_text->Draw(canvas());
+    EXPECT_EQ(1U, render_text->lines_.size());
   }
 }
 
-TEST_F(RenderTextTest, Multiline_Newline) {
+TEST_P(RenderTextHarfBuzzTest, Multiline_Newline) {
   const struct {
     const wchar_t* const text;
     const size_t lines_count;
     // Ranges of the characters on each line preceding the newline.
     const Range line_char_ranges[3];
   } kTestStrings[] = {
     {L"abc\ndef", 2ul, { Range(0, 3), Range(4, 7), Range::InvalidRange() } },
     {L"a \n b ", 2ul, { Range(0, 2), Range(3, 6), Range::InvalidRange() } },
     {L"ab\n", 2ul, { Range(0, 2), Range(), Range::InvalidRange() } },
     {L"a\n\nb", 3ul, { Range(0, 1), Range(), Range(3, 4) } },
     {L"\nab", 2ul, { Range(), Range(1, 3), Range::InvalidRange() } },
     {L"\n", 2ul, { Range(), Range(), Range::InvalidRange() } },
   };
 
-  RenderTextHarfBuzz render_text;
-  render_text.SetDisplayRect(Rect(200, 1000));
-  render_text.SetMultiline(true);
-  Canvas canvas;
+  RenderText* render_text = GetRenderText();
+  render_text->SetDisplayRect(Rect(200, 1000));
+  render_text->SetMultiline(true);
 
   for (size_t i = 0; i < arraysize(kTestStrings); ++i) {
     SCOPED_TRACE(base::StringPrintf("kTestStrings[%" PRIuS "]", i));
-    render_text.SetText(WideToUTF16(kTestStrings[i].text));
-    render_text.Draw(&canvas);
-    EXPECT_EQ(kTestStrings[i].lines_count, render_text.lines_.size());
-    if (kTestStrings[i].lines_count != render_text.lines_.size())
+    render_text->SetText(WideToUTF16(kTestStrings[i].text));
+    render_text->Draw(canvas());
+    EXPECT_EQ(kTestStrings[i].lines_count, render_text->lines_.size());
+    if (kTestStrings[i].lines_count != render_text->lines_.size())
       continue;
 
     for (size_t j = 0; j < kTestStrings[i].lines_count; ++j) {
       SCOPED_TRACE(base::StringPrintf("Line %" PRIuS "", j));
       // There might be multiple segments in one line. Merge all the segments
       // ranges in the same line.
-      const size_t segment_size = render_text.lines()[j].segments.size();
+      const size_t segment_size = render_text->lines()[j].segments.size();
       Range line_range;
       if (segment_size > 0)
-        line_range = Range(
-            render_text.lines()[j].segments[0].char_range.start(),
-            render_text.lines()[j].segments[segment_size - 1].char_range.end());
+        line_range =
+            Range(render_text->lines()[j].segments[0].char_range.start(),
+                  render_text->lines()[j]
+                      .segments[segment_size - 1]
+                      .char_range.end());
       EXPECT_EQ(kTestStrings[i].line_char_ranges[j], line_range);
     }
   }
 }
 
 // Make sure that multiline mode ignores elide behavior.
-TEST_F(RenderTextTest, Multiline_IgnoreElide) {
+TEST_P(RenderTextHarfBuzzTest, Multiline_IgnoreElide) {
   const wchar_t kTestString[] =
       L"very very very long string xxxxxxxxxxxxxxxxxxxxxxxxxx";
   const wchar_t kEllipsis[] = L"\x2026";
 
-  RenderTextHarfBuzz render_text;
-  render_text.SetElideBehavior(ELIDE_TAIL);
-  render_text.SetDisplayRect(Rect(20, 1000));
-  render_text.SetText(base::WideToUTF16(kTestString));
+  RenderText* render_text = GetRenderText();
+  render_text->SetElideBehavior(ELIDE_TAIL);
+  render_text->SetDisplayRect(Rect(20, 1000));
+  render_text->SetText(base::WideToUTF16(kTestString));
   EXPECT_NE(base::string16::npos,
-            render_text.GetDisplayText().find(base::WideToUTF16(kEllipsis)));
+            render_text->GetDisplayText().find(base::WideToUTF16(kEllipsis)));
 
-  render_text.SetMultiline(true);
+  render_text->SetMultiline(true);
   EXPECT_EQ(base::string16::npos,
-            render_text.GetDisplayText().find(base::WideToUTF16(kEllipsis)));
+            render_text->GetDisplayText().find(base::WideToUTF16(kEllipsis)));
 }
 
-TEST_F(RenderTextTest, Multiline_NewlineCharacterReplacement) {
+TEST_P(RenderTextHarfBuzzTest, Multiline_NewlineCharacterReplacement) {
   const wchar_t* kTestStrings[] = {
     L"abc\ndef", L"a \n b ", L"ab\n", L"a\n\nb", L"\nab", L"\n",
   };
 
   for (size_t i = 0; i < arraysize(kTestStrings); ++i) {
     SCOPED_TRACE(base::StringPrintf("kTestStrings[%" PRIuS "]", i));
-    RenderTextHarfBuzz render_text;
-    render_text.SetDisplayRect(Rect(200, 1000));
-    render_text.SetText(WideToUTF16(kTestStrings[i]));
+    ResetRenderTextInstance();
+    RenderText* render_text = GetRenderText();
+    render_text->SetDisplayRect(Rect(200, 1000));
+    render_text->SetText(WideToUTF16(kTestStrings[i]));
 
-    base::string16 display_text = render_text.GetDisplayText();
+    base::string16 display_text = render_text->GetDisplayText();
     // If RenderText is not multiline, the newline characters are replaced
     // by symbols, therefore the character should be changed.
-    EXPECT_NE(WideToUTF16(kTestStrings[i]), render_text.GetDisplayText());
+    EXPECT_NE(WideToUTF16(kTestStrings[i]), render_text->GetDisplayText());
 
     // Setting multiline will fix this, the newline characters will be back
     // to the original text.
-    render_text.SetMultiline(true);
-    EXPECT_EQ(WideToUTF16(kTestStrings[i]), render_text.GetDisplayText());
+    render_text->SetMultiline(true);
+    EXPECT_EQ(WideToUTF16(kTestStrings[i]), render_text->GetDisplayText());
   }
 }
 
 // Ensure horizontal alignment works in multiline mode.
-TEST_F(RenderTextTest, Multiline_HorizontalAlignment) {
+TEST_P(RenderTextHarfBuzzTest, Multiline_HorizontalAlignment) {
   const struct {
     const wchar_t* const text;
     const HorizontalAlignment alignment;
   } kTestStrings[] = {
     { L"abcdefghij\nhijkl", ALIGN_LEFT },
     { L"nhijkl\nabcdefghij", ALIGN_LEFT },
     // hebrew, 2nd line shorter
     { L"\x5d0\x5d1\x5d2\x5d3\x5d4\x5d5\x5d6\x5d7\n\x5d0\x5d1\x5d2\x5d3",
       ALIGN_RIGHT },
     // hebrew, 2nd line longer
     { L"\x5d0\x5d1\x5d2\x5d3\n\x5d0\x5d1\x5d2\x5d3\x5d4\x5d5\x5d6\x5d7",
       ALIGN_RIGHT },
     // arabic, 2nd line shorter
     { L"\x62a\x62b\x62c\x62d\x62e\x62f\x630\n\x660\x661\x662\x663\x664",
       ALIGN_RIGHT },
     // arabic, 2nd line longer
     { L"\x660\x661\x662\x663\x664\n\x62a\x62b\x62c\x62d\x62e\x62f\x630",
       ALIGN_RIGHT },
   };
   const int kGlyphSize = 5;
-  RenderTextHarfBuzz render_text;
-  render_text.SetHorizontalAlignment(ALIGN_TO_HEAD);
-  render_text.set_glyph_width_for_test(kGlyphSize);
-  render_text.SetDisplayRect(Rect(100, 1000));
-  render_text.SetMultiline(true);
+  RenderTextHarfBuzz* render_text = GetRenderTextHarfBuzz();
+  render_text->SetHorizontalAlignment(ALIGN_TO_HEAD);
+  render_text->set_glyph_width_for_test(kGlyphSize);
+  render_text->SetDisplayRect(Rect(100, 1000));
+  render_text->SetMultiline(true);
 
-  Canvas canvas;
   for (size_t i = 0; i < arraysize(kTestStrings); ++i) {
     SCOPED_TRACE(base::StringPrintf("kTestStrings[%" PRIuS "] %ls", i,
                                     kTestStrings[i].text));
-    render_text.SetText(WideToUTF16(kTestStrings[i].text));
-    render_text.Draw(&canvas);
-    ASSERT_LE(2u, render_text.lines().size());
+    render_text->SetText(WideToUTF16(kTestStrings[i].text));
+    render_text->Draw(canvas());
+    ASSERT_LE(2u, render_text->lines().size());
     if (kTestStrings[i].alignment == ALIGN_LEFT) {
-      EXPECT_EQ(0, render_text.GetAlignmentOffset(0).x());
-      EXPECT_EQ(0, render_text.GetAlignmentOffset(1).x());
+      EXPECT_EQ(0, render_text->GetAlignmentOffset(0).x());
+      EXPECT_EQ(0, render_text->GetAlignmentOffset(1).x());
     } else {
       std::vector<base::string16> lines = base::SplitString(
           base::WideToUTF16(kTestStrings[i].text),
           base::string16(1, '\n'), base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
       ASSERT_EQ(2u, lines.size());
       int difference = (lines[0].length() - lines[1].length()) * kGlyphSize;
-      EXPECT_EQ(render_text.GetAlignmentOffset(0).x() + difference,
-                render_text.GetAlignmentOffset(1).x());
+      EXPECT_EQ(render_text->GetAlignmentOffset(0).x() + difference,
+                render_text->GetAlignmentOffset(1).x());
     }
   }
 }
 
-TEST_F(RenderTextTest, Multiline_WordWrapBehavior) {
+TEST_P(RenderTextHarfBuzzTest, Multiline_WordWrapBehavior) {
   const int kGlyphSize = 5;
   const struct {
     const WordWrapBehavior behavior;
     const size_t num_lines;
     const Range char_ranges[4];
   } kTestScenarios[] = {
     { IGNORE_LONG_WORDS, 3u,
       { Range(0, 4), Range(4, 11), Range(11, 14), Range::InvalidRange() } },
     { TRUNCATE_LONG_WORDS, 3u,
       { Range(0, 4), Range(4, 8), Range(11, 14), Range::InvalidRange() } },
     { WRAP_LONG_WORDS, 4u,
       { Range(0, 4), Range(4, 8), Range(8, 11), Range(11, 14) } },
     // TODO(mukai): implement ELIDE_LONG_WORDS. It's not used right now.
   };
-  RenderTextHarfBuzz render_text;
-  render_text.SetMultiline(true);
-  render_text.SetText(ASCIIToUTF16("foo fooooo foo"));
-  render_text.set_glyph_width_for_test(kGlyphSize);
-  render_text.SetDisplayRect(Rect(0, 0, kGlyphSize * 4, 0));
-
-  Canvas canvas;
+  RenderTextHarfBuzz* render_text = GetRenderTextHarfBuzz();
+  render_text->SetMultiline(true);
+  render_text->SetText(ASCIIToUTF16("foo fooooo foo"));
+  render_text->set_glyph_width_for_test(kGlyphSize);
+  render_text->SetDisplayRect(Rect(0, 0, kGlyphSize * 4, 0));
 
   for (size_t i = 0; i < arraysize(kTestScenarios); ++i) {
     SCOPED_TRACE(base::StringPrintf(
         "kTestScenarios[%" PRIuS "] %d", i, kTestScenarios[i].behavior));
-    render_text.SetWordWrapBehavior(kTestScenarios[i].behavior);
-    render_text.Draw(&canvas);
+    render_text->SetWordWrapBehavior(kTestScenarios[i].behavior);
+    render_text->Draw(canvas());
 
-    ASSERT_EQ(kTestScenarios[i].num_lines, render_text.lines().size());
-    for (size_t j = 0; j < render_text.lines().size(); ++j) {
+    ASSERT_EQ(kTestScenarios[i].num_lines, render_text->lines().size());
+    for (size_t j = 0; j < render_text->lines().size(); ++j) {
       SCOPED_TRACE(base::StringPrintf("%" PRIuS "-th line", j));
       EXPECT_EQ(kTestScenarios[i].char_ranges[j],
-                render_text.lines()[j].segments[0].char_range);
+                render_text->lines()[j].segments[0].char_range);
       EXPECT_EQ(kTestScenarios[i].char_ranges[j].length() * kGlyphSize,
-                render_text.lines()[j].size.width());
+                render_text->lines()[j].size.width());
     }
   }
 }
 
-TEST_F(RenderTextTest, Multiline_LineBreakerBehavior) {
+TEST_P(RenderTextHarfBuzzTest, Multiline_LineBreakerBehavior) {
   const int kGlyphSize = 5;
   const struct {
     const wchar_t* const text;
     const WordWrapBehavior behavior;
     const Range char_ranges[3];
   } kTestScenarios[] = {
       { L"a single run", IGNORE_LONG_WORDS,
         {Range(0, 2), Range(2, 9), Range(9, 12) } },
       // 3 words: "That's ", ""good". ", "aaa" and 7 runs: "That", "'", "s ",
       // """, "good", "". ", "aaa". They all mixed together.
@@ skipping 14 matching lines @@
       { L"a \"good\" one.", TRUNCATE_LONG_WORDS,
         {Range(0, 2), Range(2, 6), Range(9, 13) } },
       { L"asingleword", WRAP_LONG_WORDS,
         {Range(0, 4), Range(4, 8), Range(8, 11) } },
       { L"That's good", WRAP_LONG_WORDS,
         {Range(0, 4), Range(4, 7), Range(7, 11) } },
       { L"That's \"g\".", WRAP_LONG_WORDS,
         {Range(0, 4), Range(4, 7), Range(7, 11) } },
   };
 
-  RenderTextHarfBuzz render_text;
-  render_text.SetMultiline(true);
-  render_text.set_glyph_width_for_test(kGlyphSize);
-  render_text.SetDisplayRect(Rect(0, 0, kGlyphSize * 4, 0));
-
-  Canvas canvas;
+  RenderTextHarfBuzz* render_text = GetRenderTextHarfBuzz();
+  render_text->SetMultiline(true);
+  render_text->set_glyph_width_for_test(kGlyphSize);
+  render_text->SetDisplayRect(Rect(0, 0, kGlyphSize * 4, 0));
 
   for (size_t i = 0; i < arraysize(kTestScenarios); ++i) {
     SCOPED_TRACE(base::StringPrintf("kTestStrings[%" PRIuS "]", i));
-    render_text.SetText(WideToUTF16(kTestScenarios[i].text));
-    render_text.SetWordWrapBehavior(kTestScenarios[i].behavior);
-    render_text.Draw(&canvas);
+    render_text->SetText(WideToUTF16(kTestScenarios[i].text));
+    render_text->SetWordWrapBehavior(kTestScenarios[i].behavior);
+    render_text->Draw(canvas());
 
-    ASSERT_EQ(3u, render_text.lines().size());
-    for (size_t j = 0; j < render_text.lines().size(); ++j) {
+    ASSERT_EQ(3u, render_text->lines().size());
+    for (size_t j = 0; j < render_text->lines().size(); ++j) {
       SCOPED_TRACE(base::StringPrintf("%" PRIuS "-th line", j));
       // Merge all the segments ranges in the same line.
-      size_t segment_size = render_text.lines()[j].segments.size();
+      size_t segment_size = render_text->lines()[j].segments.size();
       Range line_range;
       if (segment_size > 0)
-        line_range = Range(
-            render_text.lines()[j].segments[0].char_range.start(),
-            render_text.lines()[j].segments[segment_size - 1].char_range.end());
+        line_range =
+            Range(render_text->lines()[j].segments[0].char_range.start(),
+                  render_text->lines()[j]
+                      .segments[segment_size - 1]
+                      .char_range.end());
       EXPECT_EQ(kTestScenarios[i].char_ranges[j], line_range);
       EXPECT_EQ(kTestScenarios[i].char_ranges[j].length() * kGlyphSize,
-                render_text.lines()[j].size.width());
+                render_text->lines()[j].size.width());
     }
   }
 }
 
 // Test that Surrogate pairs or combining character sequences do not get
 // separated by line breaking.
-TEST_F(RenderTextTest, Multiline_SurrogatePairsOrCombiningChars) {
-  RenderTextHarfBuzz render_text;
-  render_text.SetMultiline(true);
-  render_text.SetWordWrapBehavior(WRAP_LONG_WORDS);
+TEST_P(RenderTextHarfBuzzTest, Multiline_SurrogatePairsOrCombiningChars) {
+  RenderTextHarfBuzz* render_text = GetRenderTextHarfBuzz();
+  render_text->SetMultiline(true);
+  render_text->SetWordWrapBehavior(WRAP_LONG_WORDS);
 
   // Below is 'MUSICAL SYMBOL G CLEF' (U+1D11E), which is represented in UTF-16
   // as two code units forming a surrogate pair: 0xD834 0xDD1E.
   const base::char16 kSurrogate[] = {0xD834, 0xDD1E, 0};
   const base::string16 text_surrogate(kSurrogate);
   const int kSurrogateWidth =
-      GetStringWidth(kSurrogate, render_text.font_list());
+      GetStringWidth(kSurrogate, render_text->font_list());
 
   // Below is a Devanagari two-character combining sequence U+0921 U+093F. The
   // sequence forms a single display character and should not be separated.
   const base::char16 kCombiningChars[] = {0x921, 0x93F, 0};
   const base::string16 text_combining(kCombiningChars);
   const int kCombiningCharsWidth =
-      GetStringWidth(kCombiningChars, render_text.font_list());
+      GetStringWidth(kCombiningChars, render_text->font_list());
 
   const struct {
     const base::string16 text;
     const int display_width;
     const Range char_ranges[3];
   } kTestScenarios[] = {
       { text_surrogate + text_surrogate + text_surrogate,
         kSurrogateWidth / 2 * 3,
         { Range(0, 2), Range(2, 4),  Range(4, 6) } },
       { text_surrogate + UTF8ToUTF16(" ") + kCombiningChars,
         std::min(kSurrogateWidth, kCombiningCharsWidth) / 2,
         { Range(0, 2), Range(2, 3), Range(3, 5) } },
   };
 
-  Canvas canvas;
-
   for (size_t i = 0; i < arraysize(kTestScenarios); ++i) {
     SCOPED_TRACE(base::StringPrintf("kTestStrings[%" PRIuS "]", i));
-    render_text.SetText(kTestScenarios[i].text);
-    render_text.SetDisplayRect(Rect(0, 0, kTestScenarios[i].display_width, 0));
-    render_text.Draw(&canvas);
+    render_text->SetText(kTestScenarios[i].text);
+    render_text->SetDisplayRect(Rect(0, 0, kTestScenarios[i].display_width, 0));
+    render_text->Draw(canvas());
 
-    ASSERT_EQ(3u, render_text.lines().size());
-    for (size_t j = 0; j < render_text.lines().size(); ++j) {
+    ASSERT_EQ(3u, render_text->lines().size());
+    for (size_t j = 0; j < render_text->lines().size(); ++j) {
       SCOPED_TRACE(base::StringPrintf("%" PRIuS "-th line", j));
       // There is only one segment in each line.
       EXPECT_EQ(kTestScenarios[i].char_ranges[j],
-                render_text.lines()[j].segments[0].char_range);
+                render_text->lines()[j].segments[0].char_range);
     }
   }
 }
 
 // Test that Zero width characters have the correct line breaking behavior.
-TEST_F(RenderTextTest, Multiline_ZeroWidthChars) {
-  RenderTextHarfBuzz render_text;
-  render_text.SetMultiline(true);
-  render_text.SetWordWrapBehavior(WRAP_LONG_WORDS);
+TEST_P(RenderTextHarfBuzzTest, Multiline_ZeroWidthChars) {
+  RenderTextHarfBuzz* render_text = GetRenderTextHarfBuzz();
+  render_text->SetMultiline(true);
+  render_text->SetWordWrapBehavior(WRAP_LONG_WORDS);
 
   const base::char16 kZeroWidthSpace = {0x200B};
   const base::string16 text(UTF8ToUTF16("test") + kZeroWidthSpace +
                             UTF8ToUTF16("\n") + kZeroWidthSpace +
                             UTF8ToUTF16("test."));
   const int kTestWidth =
-      GetStringWidth(UTF8ToUTF16("test"), render_text.font_list());
+      GetStringWidth(UTF8ToUTF16("test"), render_text->font_list());
   const Range char_ranges[3] = {Range(0, 5), Range(6, 11), Range(11, 12)};
 
-  Canvas canvas;
-  render_text.SetText(text);
-  render_text.SetDisplayRect(Rect(0, 0, kTestWidth, 0));
-  render_text.Draw(&canvas);
+  render_text->SetText(text);
+  render_text->SetDisplayRect(Rect(0, 0, kTestWidth, 0));
+  render_text->Draw(canvas());
 
-  ASSERT_EQ(3u, render_text.lines().size());
-  for (size_t j = 0; j < render_text.lines().size(); ++j) {
+  ASSERT_EQ(3u, render_text->lines().size());
+  for (size_t j = 0; j < render_text->lines().size(); ++j) {
     SCOPED_TRACE(base::StringPrintf("%" PRIuS "-th line", j));
-    int segment_size = render_text.lines()[j].segments.size();
+    int segment_size = render_text->lines()[j].segments.size();
     ASSERT_GT(segment_size, 0);
     Range line_range(
-        render_text.lines()[j].segments[0].char_range.start(),
-        render_text.lines()[j].segments[segment_size - 1].char_range.end());
+        render_text->lines()[j].segments[0].char_range.start(),
+        render_text->lines()[j].segments[segment_size - 1].char_range.end());
     EXPECT_EQ(char_ranges[j], line_range);
   }
 }
 
-TEST_F(RenderTextTest, NewlineWithoutMultilineFlag) {
+TEST_P(RenderTextHarfBuzzTest, NewlineWithoutMultilineFlag) {
   const wchar_t* kTestStrings[] = {
     L"abc\ndef", L"a \n b ", L"ab\n", L"a\n\nb", L"\nab", L"\n",
   };
 
-  RenderTextHarfBuzz render_text;
-  render_text.SetDisplayRect(Rect(200, 1000));
-  Canvas canvas;
+  RenderText* render_text = GetRenderText();
+  render_text->SetDisplayRect(Rect(200, 1000));
 
   for (size_t i = 0; i < arraysize(kTestStrings); ++i) {
     SCOPED_TRACE(base::StringPrintf("kTestStrings[%" PRIuS "]", i));
-    render_text.SetText(WideToUTF16(kTestStrings[i]));
-    render_text.Draw(&canvas);
+    render_text->SetText(WideToUTF16(kTestStrings[i]));
+    render_text->Draw(canvas());
 
-    EXPECT_EQ(1U, render_text.lines_.size());
+    EXPECT_EQ(1U, render_text->lines_.size());
   }
 }
 
 // Make sure the horizontal positions of runs in a line (left-to-right for
 // LTR languages and right-to-left for RTL languages).
-TEST_F(RenderTextTest, HarfBuzz_HorizontalPositions) {
+TEST_P(RenderTextHarfBuzzTest, HarfBuzz_HorizontalPositions) {
   const struct {
     const wchar_t* const text;
     const Range first_run_char_range;
     const Range second_run_char_range;
     bool is_rtl;
   } kTestStrings[] = {
     { L"abc\x3042\x3044\x3046\x3048\x304A", Range(0, 3), Range(3, 8), false },
     { L"\x062A\x0641\x0627\x062D"
       L"\x05EA\x05E4\x05D5\x05D6\x05D9\x05DA\x05DB\x05DD",
       Range(0, 4), Range(4, 12), true },
   };
 
-  RenderTextHarfBuzz render_text;
-  Canvas canvas;
-  TestSkiaTextRenderer renderer(&canvas);
+  RenderTextHarfBuzz* render_text = GetRenderTextHarfBuzz();
 
   for (size_t i = 0; i < arraysize(kTestStrings); ++i) {
     SCOPED_TRACE(base::StringPrintf("kTestStrings[%" PRIuS "]", i));
-    render_text.SetText(WideToUTF16(kTestStrings[i].text));
+    render_text->SetText(WideToUTF16(kTestStrings[i].text));
 
-    render_text.EnsureLayout();
-    const internal::TextRunList* run_list = render_text.GetRunList();
+    render_text->EnsureLayout();
+    const internal::TextRunList* run_list = render_text->GetRunList();
     ASSERT_EQ(2U, run_list->runs().size());
     EXPECT_EQ(kTestStrings[i].first_run_char_range, run_list->runs()[0]->range);
     EXPECT_EQ(kTestStrings[i].second_run_char_range,
               run_list->runs()[1]->range);
     // If it's RTL, the visual order is reversed.
     if (kTestStrings[i].is_rtl) {
       EXPECT_EQ(1U, run_list->logical_to_visual(0));
       EXPECT_EQ(0U, run_list->logical_to_visual(1));
     } else {
       EXPECT_EQ(0U, run_list->logical_to_visual(0));
       EXPECT_EQ(1U, run_list->logical_to_visual(1));
     }
 
-    render_text.DrawVisualText(&renderer);
+    render_text->DrawVisualText(renderer());
 
     std::vector<TestSkiaTextRenderer::TextLog> text_log;
-    renderer.GetTextLogAndReset(&text_log);
+    renderer()->GetTextLogAndReset(&text_log);
 
     EXPECT_EQ(2U, text_log.size());
 
     // Verifies the DrawText happens in the visual order and left-to-right.
     // If the text is RTL, the logically first run should be drawn at last.
     EXPECT_EQ(run_list->runs()[run_list->logical_to_visual(0)]->glyph_count,
               text_log[0].glyph_count);
     EXPECT_EQ(run_list->runs()[run_list->logical_to_visual(1)]->glyph_count,
               text_log[1].glyph_count);
     EXPECT_LT(text_log[0].origin.x(), text_log[1].origin.x());
   }
 }
 
 // Test TextRunHarfBuzz's cluster finding logic.
-TEST_F(RenderTextTest, HarfBuzz_Clusters) {
+TEST_P(RenderTextHarfBuzzTest, HarfBuzz_Clusters) {
   struct {
     uint32_t glyph_to_char[4];
     Range chars[4];
     Range glyphs[4];
     bool is_rtl;
   } cases[] = {
     { // From string "A B C D" to glyphs "a b c d".
       { 0, 1, 2, 3 },
       { Range(0, 1), Range(1, 2), Range(2, 3), Range(3, 4) },
       { Range(0, 1), Range(1, 2), Range(2, 3), Range(3, 4) },
@@ skipping 35 matching lines @@
       Range glyphs;
       run.GetClusterAt(j, &chars, &glyphs);
       EXPECT_EQ(cases[i].chars[j], chars);
       EXPECT_EQ(cases[i].glyphs[j], glyphs);
       EXPECT_EQ(cases[i].glyphs[j], run.CharRangeToGlyphRange(chars));
     }
   }
 }
 
 // Ensure that graphemes with multiple code points do not get split.
-TEST_F(RenderTextTest, HarfBuzz_SubglyphGraphemeCases) {
+TEST_P(RenderTextHarfBuzzTest, HarfBuzz_SubglyphGraphemeCases) {
   const wchar_t* cases[] = {
     // "A" with a combining umlaut, followed by a "B".
     L"A\x0308" L"B",
     // Devanagari biconsonantal conjunct "ki", followed by an "a".
     L"\x0915\x093f\x0905",
     // Thai consonant and vowel pair "cho chan" + "sara am", followed by Thai
     // digit 0.
     L"\x0e08\x0e33\x0E50",
   };
 
-  RenderTextHarfBuzz render_text;
+  RenderTextHarfBuzz* render_text = GetRenderTextHarfBuzz();
 
   for (size_t i = 0; i < arraysize(cases); ++i) {
     SCOPED_TRACE(base::StringPrintf("Case %" PRIuS, i));
 
     base::string16 text = WideToUTF16(cases[i]);
-    render_text.SetText(text);
-    render_text.EnsureLayout();
-    internal::TextRunList* run_list = render_text.GetRunList();
+    render_text->SetText(text);
+    render_text->EnsureLayout();
+    internal::TextRunList* run_list = render_text->GetRunList();
     ASSERT_EQ(1U, run_list->size());
     internal::TextRunHarfBuzz* run = run_list->runs()[0];
 
-    base::i18n::BreakIterator* iter = render_text.grapheme_iterator_.get();
+    base::i18n::BreakIterator* iter = render_text->grapheme_iterator_.get();
     auto first_grapheme_bounds = run->GetGraphemeBounds(iter, 0);
     EXPECT_EQ(first_grapheme_bounds, run->GetGraphemeBounds(iter, 1));
     auto second_grapheme_bounds = run->GetGraphemeBounds(iter, 2);
     EXPECT_EQ(first_grapheme_bounds.end(), second_grapheme_bounds.start());
   }
 }
 
 // Test the partition of a multi-grapheme cluster into grapheme ranges.
-TEST_F(RenderTextTest, HarfBuzz_SubglyphGraphemePartition) {
+TEST_P(RenderTextHarfBuzzTest, HarfBuzz_SubglyphGraphemePartition) {
   struct {
     uint32_t glyph_to_char[2];
     Range bounds[4];
     bool is_rtl;
   } cases[] = {
     { // From string "A B C D" to glyphs "a bcd".
       { 0, 1 },
       { Range(0, 10), Range(10, 13), Range(13, 17), Range(17, 20) },
       false
     },
@@ skipping 34 matching lines @@
       run.positions[j].set(j * 10, 0);
 
     for (size_t j = 0; j < 4; ++j) {
       SCOPED_TRACE(base::StringPrintf("Case %" PRIuS ", char %" PRIuS, i, j));
       EXPECT_EQ(cases[i].bounds[j],
                 run.GetGraphemeBounds(iter.get(), j).Round());
     }
   }
 }
 
-TEST_F(RenderTextTest, HarfBuzz_RunDirection) {
-  RenderTextHarfBuzz render_text;
+TEST_P(RenderTextHarfBuzzTest, HarfBuzz_RunDirection) {
+  RenderTextHarfBuzz* render_text = GetRenderTextHarfBuzz();
   const base::string16 mixed = WideToUTF16(
       L"\x05D0\x05D1"
       L"1234"
       L"\x05D2\x05D3"
       L"abc");
-  render_text.SetText(mixed);
+  render_text->SetText(mixed);
 
   // Get the run list for both display directions.
-  render_text.SetDirectionalityMode(DIRECTIONALITY_FORCE_LTR);
-  render_text.EnsureLayout();
-  internal::TextRunList* run_list = render_text.GetRunList();
+  render_text->SetDirectionalityMode(DIRECTIONALITY_FORCE_LTR);
+  render_text->EnsureLayout();
+  internal::TextRunList* run_list = render_text->GetRunList();
   ASSERT_EQ(4U, run_list->size());
   EXPECT_TRUE(run_list->runs()[0]->is_rtl);
   EXPECT_FALSE(run_list->runs()[1]->is_rtl);
   EXPECT_TRUE(run_list->runs()[2]->is_rtl);
   EXPECT_FALSE(run_list->runs()[3]->is_rtl);
 
   // The Latin letters should appear to the right of the other runs.
   EXPECT_EQ(2U, run_list->logical_to_visual(0));
   EXPECT_EQ(1U, run_list->logical_to_visual(1));
   EXPECT_EQ(0U, run_list->logical_to_visual(2));
   EXPECT_EQ(3U, run_list->logical_to_visual(3));
 
-  render_text.SetDirectionalityMode(DIRECTIONALITY_FORCE_RTL);
-  render_text.EnsureLayout();
-  run_list = render_text.GetRunList();
+  render_text->SetDirectionalityMode(DIRECTIONALITY_FORCE_RTL);
+  render_text->EnsureLayout();
+  run_list = render_text->GetRunList();
   ASSERT_EQ(4U, run_list->size());
   EXPECT_TRUE(run_list->runs()[0]->is_rtl);
   EXPECT_FALSE(run_list->runs()[1]->is_rtl);
   EXPECT_TRUE(run_list->runs()[2]->is_rtl);
   EXPECT_FALSE(run_list->runs()[3]->is_rtl);
 
   // The Latin letters should appear to the left of the other runs.
   EXPECT_EQ(3U, run_list->logical_to_visual(0));
   EXPECT_EQ(2U, run_list->logical_to_visual(1));
   EXPECT_EQ(1U, run_list->logical_to_visual(2));
   EXPECT_EQ(0U, run_list->logical_to_visual(3));
 }
 
-TEST_F(RenderTextTest, HarfBuzz_BreakRunsByUnicodeBlocks) {
-  RenderTextHarfBuzz render_text;
+TEST_P(RenderTextHarfBuzzTest, HarfBuzz_BreakRunsByUnicodeBlocks) {
+  RenderTextHarfBuzz* render_text = GetRenderTextHarfBuzz();
 
   // The '\x25B6' "play character" should break runs. http://crbug.com/278913
-  render_text.SetText(WideToUTF16(L"x\x25B6y"));
-  render_text.EnsureLayout();
-  internal::TextRunList* run_list = render_text.GetRunList();
+  render_text->SetText(WideToUTF16(L"x\x25B6y"));
+  render_text->EnsureLayout();
+  internal::TextRunList* run_list = render_text->GetRunList();
   ASSERT_EQ(3U, run_list->size());
   EXPECT_EQ(Range(0, 1), run_list->runs()[0]->range);
   EXPECT_EQ(Range(1, 2), run_list->runs()[1]->range);
   EXPECT_EQ(Range(2, 3), run_list->runs()[2]->range);
 
-  render_text.SetText(WideToUTF16(L"x \x25B6 y"));
-  render_text.EnsureLayout();
-  run_list = render_text.GetRunList();
+  render_text->SetText(WideToUTF16(L"x \x25B6 y"));
+  render_text->EnsureLayout();
+  run_list = render_text->GetRunList();
   ASSERT_EQ(4U, run_list->size());
   EXPECT_EQ(Range(0, 2), run_list->runs()[0]->range);
   EXPECT_EQ(Range(2, 3), run_list->runs()[1]->range);
   EXPECT_EQ(Range(3, 4), run_list->runs()[2]->range);
   EXPECT_EQ(Range(4, 5), run_list->runs()[3]->range);
 }
 
-TEST_F(RenderTextTest, HarfBuzz_BreakRunsByEmoji) {
-  RenderTextHarfBuzz render_text;
+TEST_P(RenderTextHarfBuzzTest, HarfBuzz_BreakRunsByEmoji) {
+  RenderTextHarfBuzz* render_text = GetRenderTextHarfBuzz();
 
   // \xF0\x9F\x98\x81 (U+1F601) is smile icon emoji. \xE2\x9C\xA8 (U+2728) is
   // a sparkle icon. Both can be drawn with color emoji fonts, so runs should be
   // separated. See crbug.com/448909
-  render_text.SetText(UTF8ToUTF16("x\xF0\x9F\x98\x81y\xE2\x9C\xA8"));
-  render_text.EnsureLayout();
-  internal::TextRunList* run_list = render_text.GetRunList();
+  render_text->SetText(UTF8ToUTF16("x\xF0\x9F\x98\x81y\xE2\x9C\xA8"));
+  render_text->EnsureLayout();
+  internal::TextRunList* run_list = render_text->GetRunList();
   ASSERT_EQ(4U, run_list->size());
   EXPECT_EQ(Range(0, 1), run_list->runs()[0]->range);
   // The length is 2 since U+1F601 is represented as a surrogate pair in UTF16.
   EXPECT_EQ(Range(1, 3), run_list->runs()[1]->range);
   EXPECT_EQ(Range(3, 4), run_list->runs()[2]->range);
   EXPECT_EQ(Range(4, 5), run_list->runs()[3]->range);
 }
 
-TEST_F(RenderTextTest, HarfBuzz_BreakRunsByAscii) {
-  RenderTextHarfBuzz render_text;
+TEST_P(RenderTextHarfBuzzTest, HarfBuzz_BreakRunsByAscii) {
+  RenderTextHarfBuzz* render_text = GetRenderTextHarfBuzz();
 
   // \xF0\x9F\x90\xB1 (U+1F431) is a cat face. It should be put into a separate
   // run from the ASCII period character.
-  render_text.SetText(UTF8ToUTF16("\xF0\x9F\x90\xB1."));
-  render_text.EnsureLayout();
-  internal::TextRunList* run_list = render_text.GetRunList();
+  render_text->SetText(UTF8ToUTF16("\xF0\x9F\x90\xB1."));
+  render_text->EnsureLayout();
+  internal::TextRunList* run_list = render_text->GetRunList();
   ASSERT_EQ(2U, run_list->size());
   // U+1F431 is represented as a surrogate pair in UTF16.
   EXPECT_EQ(Range(0, 2), run_list->runs()[0]->range);
   EXPECT_EQ(Range(2, 3), run_list->runs()[1]->range);
 }
 
-TEST_F(RenderTextTest, GlyphBounds) {
+TEST_P(RenderTextHarfBuzzTest, GlyphBounds) {
   const wchar_t* kTestStrings[] = {
       L"asdf 1234 qwer", L"\x0647\x0654", L"\x0645\x0631\x062D\x0628\x0627"
   };
-  std::unique_ptr<RenderText> render_text(new RenderTextHarfBuzz);
+  RenderText* render_text = GetRenderText();
 
   for (size_t i = 0; i < arraysize(kTestStrings); ++i) {
     render_text->SetText(WideToUTF16(kTestStrings[i]));
     render_text->EnsureLayout();
 
     for (size_t j = 0; j < render_text->text().length(); ++j)
       EXPECT_FALSE(render_text->GetGlyphBounds(j).is_empty());
   }
 }
 
 // Ensure that shaping with a non-existent font does not cause a crash.
-TEST_F(RenderTextTest, HarfBuzz_NonExistentFont) {
-  RenderTextHarfBuzz render_text;
-  render_text.SetText(ASCIIToUTF16("test"));
-  render_text.EnsureLayout();
-  internal::TextRunList* run_list = render_text.GetRunList();
+TEST_P(RenderTextHarfBuzzTest, HarfBuzz_NonExistentFont) {
+  RenderTextHarfBuzz* render_text = GetRenderTextHarfBuzz();
+  render_text->SetText(ASCIIToUTF16("test"));
+  render_text->EnsureLayout();
+  internal::TextRunList* run_list = render_text->GetRunList();
   ASSERT_EQ(1U, run_list->size());
   internal::TextRunHarfBuzz* run = run_list->runs()[0];
-  render_text.ShapeRunWithFont(render_text.text(),
-                               Font("TheFontThatDoesntExist", 13),
-                               FontRenderParams(), run);
+  render_text->ShapeRunWithFont(render_text->text(),
+                                Font("TheFontThatDoesntExist", 13),
+                                FontRenderParams(), run);
 }
 
 // Ensure an empty run returns sane values to queries.
-TEST_F(RenderTextTest, HarfBuzz_EmptyRun) {
+TEST_P(RenderTextHarfBuzzTest, HarfBuzz_EmptyRun) {
   internal::TextRunHarfBuzz run((Font()));
   const base::string16 kString = ASCIIToUTF16("abcdefgh");
   std::unique_ptr<base::i18n::BreakIterator> iter(new base::i18n::BreakIterator(
       kString, base::i18n::BreakIterator::BREAK_CHARACTER));
   ASSERT_TRUE(iter->Init());
 
   run.range = Range(3, 8);
   run.glyph_count = 0;
   EXPECT_EQ(Range(0, 0), run.CharRangeToGlyphRange(Range(4, 5)));
   EXPECT_EQ(Range(0, 0), run.GetGraphemeBounds(iter.get(), 4).Round());
   Range chars;
   Range glyphs;
   run.GetClusterAt(4, &chars, &glyphs);
   EXPECT_EQ(Range(3, 8), chars);
   EXPECT_EQ(Range(0, 0), glyphs);
 }
 
 // Ensure the line breaker doesn't compute the word's width bigger than the
 // actual size. See http://crbug.com/470073
-TEST_F(RenderTextTest, HarfBuzz_WordWidthWithDiacritics) {
-  RenderTextHarfBuzz render_text;
+TEST_P(RenderTextHarfBuzzTest, HarfBuzz_WordWidthWithDiacritics) {
+  RenderTextHarfBuzz* render_text = GetRenderTextHarfBuzz();
   const base::string16 kWord = WideToUTF16(L"\u0906\u092A\u0915\u0947 ");
-  render_text.SetText(kWord);
-  const SizeF text_size = render_text.GetStringSizeF();
+  render_text->SetText(kWord);
+  const SizeF text_size = render_text->GetStringSizeF();
 
-  render_text.SetText(kWord + kWord);
-  render_text.SetMultiline(true);
-  EXPECT_EQ(text_size.width() * 2, render_text.GetStringSizeF().width());
-  EXPECT_EQ(text_size.height(), render_text.GetStringSizeF().height());
-  render_text.SetDisplayRect(Rect(0, 0, std::ceil(text_size.width()), 0));
-  EXPECT_NEAR(text_size.width(), render_text.GetStringSizeF().width(), 1.0f);
-  EXPECT_EQ(text_size.height() * 2, render_text.GetStringSizeF().height());
+  render_text->SetText(kWord + kWord);
+  render_text->SetMultiline(true);
+  EXPECT_EQ(text_size.width() * 2, render_text->GetStringSizeF().width());
+  EXPECT_EQ(text_size.height(), render_text->GetStringSizeF().height());
+  render_text->SetDisplayRect(Rect(0, 0, std::ceil(text_size.width()), 0));
+  EXPECT_NEAR(text_size.width(), render_text->GetStringSizeF().width(), 1.0f);
+  EXPECT_EQ(text_size.height() * 2, render_text->GetStringSizeF().height());
 }
 
 // Ensure a string fits in a display rect with a width equal to the string's.
-TEST_F(RenderTextTest, StringFitsOwnWidth) {
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+TEST_P(RenderTextTest, StringFitsOwnWidth) {
+  RenderText* render_text = GetRenderText();
   const base::string16 kString = ASCIIToUTF16("www.example.com");
 
   render_text->SetText(kString);
   render_text->ApplyWeight(Font::Weight::BOLD, Range(0, 3));
   render_text->SetElideBehavior(ELIDE_TAIL);
 
   render_text->SetDisplayRect(Rect(0, 0, 500, 100));
   EXPECT_EQ(kString, render_text->GetDisplayText());
   render_text->SetDisplayRect(Rect(0, 0, render_text->GetContentWidth(), 100));
   EXPECT_EQ(kString, render_text->GetDisplayText());
 }
 
 // TODO(derat): Figure out why this fails on Windows: http://crbug.com/427184
 #if !defined(OS_WIN)
 // Ensure that RenderText examines all of the fonts in its FontList before
 // falling back to other fonts.
-TEST_F(RenderTextTest, HarfBuzz_FontListFallback) {
+TEST_P(RenderTextHarfBuzzTest, HarfBuzz_FontListFallback) {
   // Double-check that the requested fonts are present.
   FontList font_list("Arial, Symbol, 12px");
   const std::vector<Font>& fonts = font_list.GetFonts();
   ASSERT_EQ(2u, fonts.size());
   ASSERT_EQ("arial",
             base::ToLowerASCII(fonts[0].GetActualFontNameForTesting()));
   ASSERT_EQ("symbol",
             base::ToLowerASCII(fonts[1].GetActualFontNameForTesting()));
 
   // "⊕" (CIRCLED PLUS) should be rendered with Symbol rather than falling back
   // to some other font that's present on the system.
-  RenderTextHarfBuzz render_text;
-  render_text.SetFontList(font_list);
-  render_text.SetText(UTF8ToUTF16("\xE2\x8A\x95"));
+  RenderTextHarfBuzz* render_text = GetRenderTextHarfBuzz();
+  render_text->SetFontList(font_list);
+  render_text->SetText(UTF8ToUTF16("\xE2\x8A\x95"));
   const std::vector<RenderText::FontSpan> spans =
-      render_text.GetFontSpansForTesting();
+      render_text->GetFontSpansForTesting();
   ASSERT_EQ(static_cast<size_t>(1), spans.size());
   EXPECT_EQ("Symbol", spans[0].first.GetFontName());
 }
 #endif  // !defined(OS_WIN)
 
 // Ensure that the fallback fonts of the Uniscribe font are tried for shaping.
 #if defined(OS_WIN)
-TEST_F(RenderTextTest, HarfBuzz_UniscribeFallback) {
-  RenderTextHarfBuzz render_text;
+TEST_P(RenderTextHarfBuzzTest, HarfBuzz_UniscribeFallback) {
+  RenderTextHarfBuzz* render_text = GetRenderTextHarfBuzz();
   PlatformFontWin* font_win = new PlatformFontWin("Meiryo", 12);
   // Japanese name for Meiryo. This name won't be found in the system's linked
   // fonts, forcing RTHB to try the Uniscribe font and its fallbacks.
   font_win->font_ref_->font_name_ = WideToUTF8(L"\x30e1\x30a4\x30ea\x30aa");
   FontList font_list((Font(font_win)));
 
-  render_text.SetFontList(font_list);
+  render_text->SetFontList(font_list);
   // Korean character "han".
-  render_text.SetText(WideToUTF16(L"\xd55c"));
-  render_text.EnsureLayout();
-  internal::TextRunList* run_list = render_text.GetRunList();
+  render_text->SetText(WideToUTF16(L"\xd55c"));
+  render_text->EnsureLayout();
+  internal::TextRunList* run_list = render_text->GetRunList();
   ASSERT_EQ(1U, run_list->size());
   EXPECT_EQ(0U, run_list->runs()[0]->CountMissingGlyphs());
 }
 #endif  // defined(OS_WIN)
 
 // Ensure that the fallback fonts offered by GetFallbackFonts() are
 // tried. Note this test assumes the font "Arial" doesn't provide a unicode
 // glyph for a particular character, and that there exists a system fallback
 // font which does.
 // TODO(msw): Fallback doesn't find a glyph on Linux.
 #if !defined(OS_LINUX)
-TEST_F(RenderTextTest, HarfBuzz_UnicodeFallback) {
-  RenderTextHarfBuzz render_text;
-  render_text.SetFontList(FontList("Arial, 12px"));
+TEST_P(RenderTextHarfBuzzTest, HarfBuzz_UnicodeFallback) {
+  RenderTextHarfBuzz* render_text = GetRenderTextHarfBuzz();
+  render_text->SetFontList(FontList("Arial, 12px"));
 
   // Korean character "han".
-  render_text.SetText(WideToUTF16(L"\xd55c"));
-  render_text.EnsureLayout();
-  internal::TextRunList* run_list = render_text.GetRunList();
+  render_text->SetText(WideToUTF16(L"\xd55c"));
+  render_text->EnsureLayout();
+  internal::TextRunList* run_list = render_text->GetRunList();
   ASSERT_EQ(1U, run_list->size());
   EXPECT_EQ(0U, run_list->runs()[0]->CountMissingGlyphs());
 }
 #endif  // !defined(OS_LINUX)
 
 // http://crbug/624513
-#if defined(OS_WIN)
-#define MAYBE_TextDoesntClip DISABLED_TextDoesntClip
-#else
-#define MAYBE_TextDoesntClip TextDoesntClip
-#endif
+#if !defined(OS_WIN)
 // Ensure that the width reported by RenderText is sufficient for drawing. Draws
 // to a canvas and checks if any pixel beyond the bounding rectangle is colored.
-TEST_F(RenderTextTest, MAYBE_TextDoesntClip) {
+TEST_P(RenderTextTest, TextDoesntClip) {
+// Fails on Mac with RenderTextHarfBuzz. See http://crbug.com/640068.
+#if defined(OS_MACOSX)
+  if (GetParam() == RENDER_TEXT_HARFBUZZ)
+    return;
+#endif
+
   const wchar_t* kTestStrings[] = {
       L"            ",
       // TODO(dschuyler): Underscores draw outside GetStringSize;
       // crbug.com/459812.  This appears to be a preexisting issue that wasn't
       // revealed by the prior unit tests.
       // L"TEST_______",
       L"TEST some stuff",
       L"WWWWWWWWWW",
       L"gAXAXAXAXAXAXA",
       // TODO(dschuyler): A-Ring draws outside GetStringSize; crbug.com/459812.
       // L"g\x00C5X\x00C5X\x00C5X\x00C5X\x00C5X\x00C5X\x00C5",
       L"\x0647\x0654\x0647\x0654\x0647\x0654\x0647\x0654\x0645\x0631\x062D"
       L"\x0628\x0627"};
   const Size kCanvasSize(300, 50);
   const int kTestSize = 10;
 
   sk_sp<SkSurface> surface =
       SkSurface::MakeRasterN32Premul(kCanvasSize.width(), kCanvasSize.height());
   Canvas canvas(sk_ref_sp(surface->getCanvas()), 1.0f);
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  RenderText* render_text = GetRenderText();
   render_text->SetHorizontalAlignment(ALIGN_LEFT);
   render_text->SetColor(SK_ColorBLACK);
 
   for (auto* string : kTestStrings) {
     surface->getCanvas()->clear(SK_ColorWHITE);
     render_text->SetText(WideToUTF16(string));
     const Size string_size = render_text->GetStringSize();
     render_text->ApplyBaselineStyle(SUPERSCRIPT, Range(1, 2));
     render_text->ApplyBaselineStyle(SUPERIOR, Range(3, 4));
     render_text->ApplyBaselineStyle(INFERIOR, Range(5, 6));
@@ skipping 60 matching lines @@
       // TODO(dschuyler): On Mac text draws to right of GetStringSize.  This
       // appears to be a preexisting issue that wasn't revealed by the prior
       // unit tests.
       rect_buffer.EnsureSolidRect(SK_ColorWHITE,
                                   kTestSize + string_size.width(), kTestSize,
                                   kTestSize, string_size.height());
 #endif
     }
   }
 }
+#endif  // !defined(OS_WIN)
 
 // Ensure that the text will clip to the display rect. Draws to a canvas and
 // checks whether any pixel beyond the bounding rectangle is colored.
-TEST_F(RenderTextTest, TextDoesClip) {
+TEST_P(RenderTextTest, TextDoesClip) {
   const wchar_t* kTestStrings[] = {L"TEST", L"W", L"WWWW", L"gAXAXWWWW"};
   const Size kCanvasSize(300, 50);
   const int kTestSize = 10;
 
   sk_sp<SkSurface> surface =
       SkSurface::MakeRasterN32Premul(kCanvasSize.width(), kCanvasSize.height());
   Canvas canvas(sk_ref_sp(surface->getCanvas()), 1.0f);
-  std::unique_ptr<RenderText> render_text(RenderText::CreateInstance());
+  RenderText* render_text = GetRenderText();
   render_text->SetHorizontalAlignment(ALIGN_LEFT);
   render_text->SetColor(SK_ColorBLACK);
 
   for (auto* string : kTestStrings) {
     surface->getCanvas()->clear(SK_ColorWHITE);
     render_text->SetText(WideToUTF16(string));
     const Size string_size = render_text->GetStringSize();
     int fake_width = string_size.width() / 2;
     int fake_height = string_size.height() / 2;
     render_text->SetDisplayRect(
@@ skipping 25 matching lines @@
     }
     {
       SCOPED_TRACE("TextDoesClip Right Side");
       rect_buffer.EnsureSolidRect(SK_ColorWHITE, kTestSize + fake_width,
                                   kTestSize, kTestSize, fake_height);
     }
   }
 }
 
 #if defined(OS_MACOSX)
-TEST_F(RenderTextTest, Mac_ElidedText) {
-  RenderTextMac render_text;
+TEST_P(RenderTextMacTest, Mac_ElidedText) {
+  RenderTextMac* render_text = GetRenderTextMac();
   base::string16 text(ASCIIToUTF16("This is an example."));
-  render_text.SetText(text);
-  Size string_size = render_text.GetStringSize();
-  render_text.SetDisplayRect(Rect(string_size));
-  render_text.EnsureLayout();
+  render_text->SetText(text);
+  Size string_size = render_text->GetStringSize();
+  render_text->SetDisplayRect(Rect(string_size));
+  render_text->EnsureLayout();
   // NOTE: Character and glyph counts are only comparable for simple text.
   EXPECT_EQ(text.size(),
-            static_cast<size_t>(CTLineGetGlyphCount(render_text.line_)));
+            static_cast<size_t>(CTLineGetGlyphCount(render_text->line_)));
 
-  render_text.SetElideBehavior(ELIDE_TAIL);
+  render_text->SetElideBehavior(ELIDE_TAIL);
   string_size.set_width(string_size.width() / 2);
-  render_text.SetDisplayRect(Rect(string_size));
-  render_text.EnsureLayout();
-  CFIndex glyph_count = CTLineGetGlyphCount(render_text.line_);
+  render_text->SetDisplayRect(Rect(string_size));
+  render_text->EnsureLayout();
+  CFIndex glyph_count = CTLineGetGlyphCount(render_text->line_);
   EXPECT_GT(text.size(), static_cast<size_t>(glyph_count));
   EXPECT_NE(0, glyph_count);
 }
-#endif
+#endif  // defined(OS_MACOSX)
 
 // Ensure color changes are picked up by the RenderText implementation.
-TEST_F(RenderTextTest, ColorChange) {
-  RenderTextAllBackends backend;
+TEST_P(RenderTextTest, ColorChange) {
+  RenderText* render_text = GetRenderText();
+  render_text->SetText(ASCIIToUTF16("x"));
+  DrawVisualText();
 
-  while (backend.Advance()) {
-    SCOPED_TRACE(testing::Message() << "backend: " << backend.GetName());
-    backend->SetText(ASCIIToUTF16("x"));
-    backend.DrawVisualText();
+  std::vector<TestSkiaTextRenderer::TextLog> text_log;
+  renderer()->GetTextLogAndReset(&text_log);
+  EXPECT_EQ(1u, text_log.size());
+  EXPECT_EQ(SK_ColorBLACK, text_log[0].color);
 
-    std::vector<TestSkiaTextRenderer::TextLog> text_log;
-    backend.GetTextLogAndReset(&text_log);
-    EXPECT_EQ(1u, text_log.size());
-    EXPECT_EQ(SK_ColorBLACK, text_log[0].color);
+  render_text->SetColor(SK_ColorRED);
+  DrawVisualText();
+  renderer()->GetTextLogAndReset(&text_log);
 
-    backend->SetColor(SK_ColorRED);
-    backend.DrawVisualText();
-    backend.GetTextLogAndReset(&text_log);
-
-    EXPECT_EQ(1u, text_log.size());
-    EXPECT_EQ(SK_ColorRED, text_log[0].color);
-  }
+  EXPECT_EQ(1u, text_log.size());
+  EXPECT_EQ(SK_ColorRED, text_log[0].color);
 }
 
 // Ensure style information propagates to the typeface on the text renderer.
-TEST_F(RenderTextTest, StylePropagated) {
-  RenderTextAllBackends backend;
-
+TEST_P(RenderTextTest, StylePropagated) {
+  RenderText* render_text = GetRenderText();
   // Default-constructed fonts on Mac are system fonts. These can have all kinds
   // of weird weights and style, which are preserved by PlatformFontMac, but do
   // not map simply to a SkTypeface::Style (the full details in SkFontStyle is
   // needed). They also vary depending on the OS version, so set a known font.
   FontList font_list(Font("Arial", 10));
 
-  while (backend.Advance()) {
-    SCOPED_TRACE(testing::Message() << "backend: " << backend.GetName());
-    backend->SetText(ASCIIToUTF16("x"));
-    backend->SetFontList(font_list);
+  render_text->SetText(ASCIIToUTF16("x"));
+  render_text->SetFontList(font_list);
 
-    backend.DrawVisualText();
-    EXPECT_EQ(SkTypeface::kNormal, backend.paint().getTypeface()->style());
+  DrawVisualText();
+  EXPECT_EQ(SkTypeface::kNormal, GetRendererPaint().getTypeface()->style());
 
-    backend->SetWeight(Font::Weight::BOLD);
-    backend.DrawVisualText();
-    EXPECT_EQ(SkTypeface::kBold, backend.paint().getTypeface()->style());
+  render_text->SetWeight(Font::Weight::BOLD);
+  DrawVisualText();
+  EXPECT_EQ(SkTypeface::kBold, GetRendererPaint().getTypeface()->style());
 
-    backend->SetStyle(TextStyle::ITALIC, true);
-    backend.DrawVisualText();
-    EXPECT_EQ(SkTypeface::kBoldItalic, backend.paint().getTypeface()->style());
+  render_text->SetStyle(TextStyle::ITALIC, true);
+  DrawVisualText();
+  EXPECT_EQ(SkTypeface::kBoldItalic, GetRendererPaint().getTypeface()->style());
 
-    backend->SetWeight(Font::Weight::NORMAL);
-    backend.DrawVisualText();
-    EXPECT_EQ(SkTypeface::kItalic, backend.paint().getTypeface()->style());
-  }
+  render_text->SetWeight(Font::Weight::NORMAL);
+  DrawVisualText();
+  EXPECT_EQ(SkTypeface::kItalic, GetRendererPaint().getTypeface()->style());
 }
 
 // Ensure the painter adheres to RenderText::subpixel_rendering_suppressed().
-TEST_F(RenderTextTest, SubpixelRenderingSuppressed) {
-  RenderTextAllBackends backend;
+TEST_P(RenderTextTest, SubpixelRenderingSuppressed) {
+  RenderText* render_text = GetRenderText();
+  render_text->SetText(ASCIIToUTF16("x"));
 
-  while (backend.Advance()) {
-    SCOPED_TRACE(testing::Message() << "backend: " << backend.GetName());
-    backend->SetText(ASCIIToUTF16("x"));
+  DrawVisualText();
+#if defined(OS_LINUX)
+  // On Linux, whether subpixel AA is supported is determined by the platform
+  // FontConfig. Force it into a particular style after computing runs. Other
+  // platforms use a known default FontRenderParams from a static local.
+  GetHarfBuzzRunList()->runs()[0]->render_params.subpixel_rendering =
+      FontRenderParams::SUBPIXEL_RENDERING_RGB;
+  DrawVisualText();
+#endif
+  EXPECT_TRUE(GetRendererPaint().isLCDRenderText());
 
-    backend.DrawVisualText();
-#if defined(OS_LINUX)
-    // On Linux, whether subpixel AA is supported is determined by the platform
-    // FontConfig. Force it into a particular style after computing runs. Other
-    // platforms use a known default FontRenderParams from a static local.
-    backend.GetHarfbuzzRunList()->runs()[0]->render_params.subpixel_rendering =
-        FontRenderParams::SUBPIXEL_RENDERING_RGB;
-    backend.DrawVisualText();
-#endif
-    EXPECT_TRUE(backend.paint().isLCDRenderText());
-
-    backend->set_subpixel_rendering_suppressed(true);
-    backend.DrawVisualText();
+  render_text->set_subpixel_rendering_suppressed(true);
+  DrawVisualText();
 #if defined(OS_LINUX)
     // For Linux, runs shouldn't be re-calculated, and the suppression of the
     // SUBPIXEL_RENDERING_RGB set above should now take effect. But, after
     // checking, apply the override anyway to be explicit that it is suppressed.
-    EXPECT_FALSE(backend.paint().isLCDRenderText());
-    backend.GetHarfbuzzRunList()->runs()[0]->render_params.subpixel_rendering =
+    EXPECT_FALSE(GetRendererPaint().isLCDRenderText());
+    GetHarfBuzzRunList()->runs()[0]->render_params.subpixel_rendering =
         FontRenderParams::SUBPIXEL_RENDERING_RGB;
-    backend.DrawVisualText();
+    DrawVisualText();
 #endif
-    EXPECT_FALSE(backend.paint().isLCDRenderText());
-  }
+    EXPECT_FALSE(GetRendererPaint().isLCDRenderText());
 }
 
+// Prefix for test instantiations intentionally left blank since each test
+// fixture class has a single parameterization.
+#if defined(OS_MACOSX)
+INSTANTIATE_TEST_CASE_P(,
+                        RenderTextTest,
+                        ::testing::Values(RENDER_TEXT_HARFBUZZ,
+                                          RENDER_TEXT_MAC),
+                        PrintRenderTextBackend());
+INSTANTIATE_TEST_CASE_P(,
+                        RenderTextMacTest,
+                        ::testing::Values(RENDER_TEXT_MAC),
+                        PrintRenderTextBackend());
+#else
+INSTANTIATE_TEST_CASE_P(,
+                        RenderTextTest,
+                        ::testing::Values(RENDER_TEXT_HARFBUZZ),
+                        PrintRenderTextBackend());
+#endif
+
+INSTANTIATE_TEST_CASE_P(,
+                        RenderTextHarfBuzzTest,
+                        ::testing::Values(RENDER_TEXT_HARFBUZZ),
+                        PrintRenderTextBackend());
+
 }  // namespace gfx