More or less implement RenderTextHarfBuzz

ui/gfx/render_text.h

Index: ui/gfx/render_text.h
diff --git a/ui/gfx/render_text.h b/ui/gfx/render_text.h
index 93054b4487a76c1e16eeaebccb655b747aedcd49..dde179432afd292bc1eba1fa00b32f534505a7bd 100644
--- a/ui/gfx/render_text.h
+++ b/ui/gfx/render_text.h
@@ -79,6 +79,8 @@ class SkiaTextRenderer {
   void DrawUnderline(int x, int y, int width);
   void DrawStrike(int x, int y, int width) const;
 
+  SkPaint paint() const { return paint_; }
+
  private:
   // Helper class to draw a diagonal line with multiple pieces of different
   // lengths and colors; to support text selection appearances.
@@ -94,6 +96,7 @@ class SkiaTextRenderer {
     typedef std::pair<int, SkColor> Piece;
 
     Canvas* canvas_;
+    SkMatrix matrix_;
     const Point start_;
     SkPaint paint_;
     int total_length_;
@@ -176,6 +179,10 @@ struct Line {
   int baseline;
 };
 
+// Creates an SkTypeface from a font |family| name and a |gfx::Font::FontStyle|.
+skia::RefPtr<SkTypeface> CreateSkiaTypeface(const std::string& family,
+                                            int style);
+
 }  // namespace internal
 
 // RenderText represents an abstract model of styled text and its corresponding
@@ -186,7 +193,7 @@ class GFX_EXPORT RenderText {
  public:
   virtual ~RenderText();
 
-  // Creates a platform-specific RenderText instance.
+  // Creates a platform-specific or cross-platform RenderText instance.
   static RenderText* CreateInstance();
 
   const base::string16& text() const { return text_; }
@@ -572,6 +579,9 @@ class GFX_EXPORT RenderText {
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, Multiline_SufficientWidth);
   FRIEND_TEST_ALL_PREFIXES(RenderTextTest, Multiline_Newline);
 
+  // Creates a platform-specific RenderText instance.
+  static RenderText* CreateNativeInstance();
+
   // Set the cursor to |position|, with the caret trailing the previous
   // grapheme, or if there is no previous grapheme, leading the cursor position.
   // If |select| is false, the selection start is moved to the same position.