Move SkV8Example to SkSurface

experimental/SkV8Example/SkV8Example.h

 /*
  * Copyright 2013 Google Inc.
  *
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *
  */
 
 #ifndef SkV8Example_DEFINED
 #define SkV8Example_DEFINED
 
 #include "SkWindow.h"
 
 class GrContext;
 class GrGLInterface;
 class GrRenderTarget;
+class SkSurface;
 
 class JsContext;
 
 class SkV8ExampleWindow : public SkOSWindow {
 public:
     SkV8ExampleWindow(void* hwnd, JsContext* canvas);
 
 protected:
     virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE;
     virtual void onSizeChange() SK_OVERRIDE;
 
 #if SK_SUPPORT_GPU
     virtual SkCanvas* createCanvas() SK_OVERRIDE;
 #endif
 
 #ifdef SK_BUILD_FOR_WIN
     virtual void onHandleInval(const SkIRect&) SK_OVERRIDE;
 #endif
 
     void windowSizeChanged();
 
 private:
     typedef SkOSWindow INHERITED;
     JsContext* fJsContext;
 
 #if SK_SUPPORT_GPU
     GrContext*              fCurContext;
     const GrGLInterface*    fCurIntf;
     GrRenderTarget*         fCurRenderTarget;
+    SkSurface*              fCurSurface;
 #endif
 };
 
 #endif