RenderTextMac: Fix crash when passed an invalid font.

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>
 
@@ skipping 4331 matching lines @@
 
     render_text->SelectRange(line_char_range[i]);
     EXPECT_EQ(expected_line_bounds, GetSelectionBoundsUnion());
   }
 
   // Test complete bounds.
   render_text->SelectAll(false);
   EXPECT_EQ(expected_total_bounds, GetSelectionBoundsUnion());
 }
 
+// Tests that RenderText doesn't crash even if it's passed an invalid font. Test
+// for crbug.com/668058.
+TEST_P(RenderTextTest, InvalidFont) {
+// TODO(crbug.com/699820): This crashes with RenderTextHarfBuzz on Mac.
+#if defined(OS_MACOSX)
+  if (GetParam() == RENDER_TEXT_HARFBUZZ)
+    return;
+#endif
+  const std::string font_name = "invalid_font";
+  const int kFontSize = 13;
+  RenderText* render_text = GetRenderText();
+  render_text->SetFontList(FontList(Font(font_name, kFontSize)));
+  render_text->SetText(ASCIIToUTF16("abc"));
+
+  DrawVisualText();
+}
+
 // 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