Use SkMatrix44 for the underlying implementation of ui::Transform

ui/gfx/canvas.h

 // Copyright (c) 2011 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_CANVAS_H_
 #define UI_GFX_CANVAS_H_
 #pragma once
 
 #include <string>
 
@@ skipping 196 matching lines @@
                             int dest_x, int dest_y, int w, int h) = 0;
 
   // Returns a native drawing context for platform specific drawing routines to
   // use. Must be balanced by a call to EndPlatformPaint().
   virtual gfx::NativeDrawingContext BeginPlatformPaint() = 0;
 
   // Signifies the end of platform drawing using the native drawing context
   // returned by BeginPlatformPaint().
   virtual void EndPlatformPaint() = 0;
 
+#if !defined(OS_MACOSX)
   // Apply transformation on the canvas.
   virtual void Transform(const ui::Transform& transform) = 0;
+#endif
 
   // Create a texture ID that can be used for accelerated drawing.
   virtual ui::TextureID GetTextureID() = 0;
 
   // TODO(beng): remove this once we don't need to use any skia-specific methods
   //             through this interface.
   // A quick and dirty way to obtain the underlying SkCanvas.
   virtual CanvasSkia* AsCanvasSkia();
   virtual const CanvasSkia* AsCanvasSkia() const;
 };
@@ skipping 12 matching lines @@
   // Returns the rectangle that is invalid.
   virtual gfx::Rect GetInvalidRect() const = 0;
 
   // Returns the underlying Canvas.
   virtual Canvas* AsCanvas() = 0;
 };
 
 }  // namespace gfx;
 
 #endif  // UI_GFX_CANVAS_H_