Add Sky framework support for drawing images

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"
 #include "sky/engine/core/painting/Rect.h"
 #include "sky/engine/platform/graphics/DisplayList.h"
 #include "sky/engine/tonic/dart_wrappable.h"
 #include "sky/engine/wtf/PassRefPtr.h"
 #include "sky/engine/wtf/RefCounted.h"
 
 namespace blink {
 class Element;
+class CanvasImage;
 
 class Canvas : public RefCounted<Canvas>, public DartWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
     Canvas(const FloatSize& size);
     ~Canvas() override;
 
     // Width/Height define a culling rect which Skia may use for optimizing
     // out draw calls issued outside the rect.
     float width() const { return m_size.width(); }
@@ skipping 10 matching lines @@
     void concat(const Vector<float>& matrix);
 
     void clipRect(const Rect& rect);
 
     void drawPicture(Picture* picture);
     void drawPaint(const Paint* paint);
     void drawRect(const Rect& rect, 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);
 
     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_