update example

include/views/SkWindow.h

Index: include/views/SkWindow.h
diff --git a/include/views/SkWindow.h b/include/views/SkWindow.h
index e18aff35123237b2e65dc4388738c986de85dcbe..76a1aa5947b08c1a6b2b60a794670f1dab007879 100644
--- a/include/views/SkWindow.h
+++ b/include/views/SkWindow.h
@@ -25,11 +25,22 @@
 class SkSurface;
 class SkOSMenu;
 
+#if SK_SUPPORT_GPU
+struct GrGLInterface;
+class GrContext;
+class GrRenderTarget;
+#endif
+
 class SkWindow : public SkView {
 public:
             SkWindow();
     virtual ~SkWindow();
 
+    struct AttachmentInfo {
+        int fSampleCount;
+        int fStencilBits;
+    };
+
     SkSurfaceProps getSurfaceProps() const { return fSurfaceProps; }
     void setSurfaceProps(const SkSurfaceProps& props) {
         fSurfaceProps = props;
@@ -85,6 +96,11 @@ protected:
     virtual bool onGetFocusView(SkView** focus) const;
     virtual bool onSetFocusView(SkView* focus);
 
+#if SK_SUPPORT_GPU
+    GrRenderTarget* renderTarget(const AttachmentInfo& attachmentInfo,
+                                 const GrGLInterface* , GrContext* grContext);
+#endif
+
 private:
     SkSurfaceProps  fSurfaceProps;
     SkColorType fColorType;