Make Graphics3D::SwapBuffers take a completion callback

webkit/plugins/ppapi/ppb_surface_3d_impl.h

Index: webkit/plugins/ppapi/ppb_surface_3d_impl.h
diff --git a/webkit/plugins/ppapi/ppb_surface_3d_impl.h b/webkit/plugins/ppapi/ppb_surface_3d_impl.h
index d09689ed48d984d035b70daaf54afdec7aa9544b..0cd06437a4dd634dcc3ab990f898f4b3be9199b6 100644
--- a/webkit/plugins/ppapi/ppb_surface_3d_impl.h
+++ b/webkit/plugins/ppapi/ppb_surface_3d_impl.h
@@ -49,7 +49,10 @@ class PPB_Surface3D_Impl : public Resource {
 
   unsigned int GetBackingTextureId();
 
-  bool SwapBuffers();
+  bool SwapBuffers(PP_CompletionCallback callback);
+
+  void ViewInitiatedPaint();
+  void ViewFlushedPaint();
 
  private:
   // Called when SwapBuffers is complete.
@@ -59,6 +62,10 @@ class PPB_Surface3D_Impl : public Resource {
   PluginInstance* instance_;
   bool bound_to_instance_;
 
+  // True when the page's SwapBuffers has been issued but not returned yet.
+  bool swap_initiated_;
+  PP_CompletionCallback swap_callback_;
+
   // The context this surface is currently bound to.
   PluginDelegate::PlatformContext3D* context_;