Re-land RenderTextHarfBuzz: Decide run direction by BiDi embedding level

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 <algorithm>
 
 #include "base/format_macros.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 1959 matching lines @@
     for (size_t j = 0; j < 4; ++j) {
       SCOPED_TRACE(base::StringPrintf("Case %" PRIuS ", char %" PRIuS, i, j));
       EXPECT_EQ(cases[i].char_to_glyph_expected[j], run.CharToGlyph(j));
       EXPECT_EQ(cases[i].char_range_to_glyph_range_expected[j],
                 run.CharRangeToGlyphRange(Range(j, j + 1)));
     }
   }
 
 }
 
+TEST_F(RenderTextTest, HarfBuzz_RunDirection) {
+  RenderTextHarfBuzz render_text;
+  const base::string16 mixed =
+      WideToUTF16(L"\x05D0\x05D1" L"1234" L"\x05D2\x05D3");
+  render_text.SetText(mixed);
+  render_text.EnsureLayout();
+  ASSERT_EQ(3U, render_text.runs_.size());
+  EXPECT_TRUE(render_text.runs_[0]->is_rtl);
+  EXPECT_FALSE(render_text.runs_[1]->is_rtl);
+  EXPECT_TRUE(render_text.runs_[2]->is_rtl);
+}
+
 }  // namespace gfx