Adds basic sprite sheet support to sprites

sky/engine/core/painting/Canvas.h

 // Copyright 2015 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 SKY_ENGINE_CORE_PAINTING_CANVAS_H_
 #define SKY_ENGINE_CORE_PAINTING_CANVAS_H_
 
 #include "sky/engine/core/painting/CanvasPath.h"
 #include "sky/engine/core/painting/Paint.h"
 #include "sky/engine/core/painting/Picture.h"
@@ skipping 39 matching lines @@
     void drawPaint(const Paint* paint);
     void drawRect(const Rect& rect, const Paint* paint);
     void drawRRect(const RRect* rrect, const Paint* paint);
     void drawOval(const Rect& rect, const Paint* paint);
     void drawCircle(float x, float y, float radius, const Paint* paint);
     void drawPath(const CanvasPath* path, const Paint* paint);
     void drawImage(const CanvasImage* image,
                    float x,
                    float y,
                    const Paint* paint);
+    void drawImageRect(const CanvasImage* image, Rect& src, Rect& dst, Paint* paint);
 
     SkCanvas* skCanvas() { return m_canvas; }
 
 protected:
     PassRefPtr<DisplayList> finishRecording();
 
     bool isRecording() const { return m_canvas; }
 
 private:
     FloatSize m_size;
     RefPtr<DisplayList> m_displayList;
     SkCanvas* m_canvas;
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_CORE_PAINTING_CANVAS_H_