Replace StyleRange with BreakList; update RenderText, etc.

ui/gfx/render_text_linux.h

Index: ui/gfx/render_text_linux.h
diff --git a/ui/gfx/render_text_linux.h b/ui/gfx/render_text_linux.h
index 12f61ba7fd1d80039ff47272e11a0be1b7061698..2abdf2b07488bffd356533b7a5c2a3dd06305b94 100644
--- a/ui/gfx/render_text_linux.h
+++ b/ui/gfx/render_text_linux.h
@@ -45,6 +45,9 @@ class RenderTextLinux : public RenderText {
   virtual void DrawVisualText(Canvas* canvas) OVERRIDE;
 
  private:
+  friend class RenderTextTest;
+  FRIEND_TEST_ALL_PREFIXES(RenderTextTest, PangoAttributes);
+
   // Returns the run that contains the character attached to the caret in the
   // given selection model. Return NULL if not found.
   GSList* GetRunContainingCaret(const SelectionModel& caret) const;
@@ -71,6 +74,9 @@ class RenderTextLinux : public RenderText {
   // Get the visual bounds of the logical selection.
   std::vector<Rect> GetSelectionBounds();
 
+  // Get the text index corresponding to the |run|'s |glyph_index|.
+  size_t GetGlyphTextIndex(PangoLayoutRun* run, int glyph_index) const;
+
   // Pango Layout.
   PangoLayout* layout_;
   // A single line layout resulting from laying out via |layout_|.