ui/gfx: Make gfx::Canvas inherit from gfx::CanvasSkia.

chrome/browser/ui/views/tabs/tab.h

Index: chrome/browser/ui/views/tabs/tab.h
diff --git a/chrome/browser/ui/views/tabs/tab.h b/chrome/browser/ui/views/tabs/tab.h
index 73d24dc766edfed5d44b5b9a34ea8c35fbb225a6..ccd19ffc8d6711d01af98b8666758a39a5e55d31 100644
--- a/chrome/browser/ui/views/tabs/tab.h
+++ b/chrome/browser/ui/views/tabs/tab.h
@@ -68,7 +68,7 @@ class Tab : public BaseTab {
 
  private:
   // Overridden from views::View:
-  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+  virtual void OnPaint(gfx::CanvasSkia* canvas) OVERRIDE;
   virtual void Layout() OVERRIDE;
   virtual void OnThemeChanged() OVERRIDE;
   virtual std::string GetClassName() const OVERRIDE;
@@ -79,10 +79,10 @@ class Tab : public BaseTab {
   virtual void OnMouseMoved(const views::MouseEvent& event) OVERRIDE;
 
   // Paint various portions of the Tab
-  void PaintTabBackground(gfx::Canvas* canvas);
-  void PaintInactiveTabBackgroundWithTitleChange(gfx::Canvas* canvas);
-  void PaintInactiveTabBackground(gfx::Canvas* canvas);
-  void PaintActiveTabBackground(gfx::Canvas* canvas);
+  void PaintTabBackground(gfx::CanvasSkia* canvas);
+  void PaintInactiveTabBackgroundWithTitleChange(gfx::CanvasSkia* canvas);
+  void PaintInactiveTabBackground(gfx::CanvasSkia* canvas);
+  void PaintActiveTabBackground(gfx::CanvasSkia* canvas);
 
   // Returns the number of favicon-size elements that can fit in the tab's
   // current size.