RenderTextMac: Cache the SkTypeface on the TextRun [reland]

ui/gfx/render_text.h

 // 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.
 
 #ifndef UI_GFX_RENDER_TEXT_H_
 #define UI_GFX_RENDER_TEXT_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 44 matching lines @@
 class GFX_EXPORT SkiaTextRenderer {
  public:
   explicit SkiaTextRenderer(Canvas* canvas);
   virtual ~SkiaTextRenderer();
 
   void SetDrawLooper(sk_sp<SkDrawLooper> draw_looper);
   void SetFontRenderParams(const FontRenderParams& params,
                            bool subpixel_rendering_suppressed);
   void SetTypeface(SkTypeface* typeface);
   void SetTextSize(SkScalar size);
-  void SetFontWithStyle(const Font& font, int font_style);
   void SetForegroundColor(SkColor foreground);
   void SetShader(sk_sp<SkShader> shader);
   // Sets underline metrics to use if the text will be drawn with an underline.
   // If not set, default values based on the size of the text will be used. The
   // two metrics must be set together.
   void SetUnderlineMetrics(SkScalar thickness, SkScalar position);
   void DrawSelection(const std::vector<Rect>& selection, SkColor color);
   virtual void DrawPosText(const SkPoint* pos,
                            const uint16_t* glyphs,
                            size_t glyph_count);
@@ skipping 104 matching lines @@
   SizeF size;
 
   // Sum of preceding lines' heights.
   int preceding_heights;
 
   // Maximum baseline of all segments on this line.
   int baseline;
 };
 
 // Creates an SkTypeface from a font and a |gfx::Font::FontStyle|.
-// May return NULL.
-skia::RefPtr<SkTypeface> CreateSkiaTypeface(const gfx::Font& font, int style);
+// May return null.
+sk_sp<SkTypeface> CreateSkiaTypeface(const gfx::Font& font, int style);
 
 // Applies the given FontRenderParams to a Skia |paint|.
 void ApplyRenderParams(const FontRenderParams& params,
                        bool subpixel_rendering_suppressed,
                        SkPaint* paint);
 
 }  // namespace internal
 
 // RenderText represents an abstract model of styled text and its corresponding
 // visual layout. Support is built in for a cursor, a selection, simple styling,
@@ skipping 619 matching lines @@
   // Lines computed by EnsureLayout. These should be invalidated upon
   // OnLayoutTextAttributeChanged and OnDisplayTextAttributeChanged calls.
   std::vector<internal::Line> lines_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderText);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RENDER_TEXT_H_