Make Graphics3D::SwapBuffers take a completion callback

webkit/plugins/ppapi/ppb_surface_3d_impl.h

 // Copyright (c) 2010 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 WEBKIT_PLUGINS_PPAPI_PPB_SURFACE_3D_IMPL_H_
 #define WEBKIT_PLUGINS_PPAPI_PPB_SURFACE_3D_IMPL_H_
 
 #include "base/callback.h"
 #include "ppapi/c/dev/ppb_surface_3d_dev.h"
 #include "webkit/plugins/ppapi/plugin_delegate.h"
@@ skipping 31 matching lines @@
   // window. Returns true if binding/unbinding is successful.
   bool BindToInstance(bool bind);
 
   // Binds the context such that all draw calls to context
   // affect this surface. To unbind call this function will NULL context.
   // Returns true if successful.
   bool BindToContext(PluginDelegate::PlatformContext3D* context);
 
   unsigned int GetBackingTextureId();
 
-  bool SwapBuffers();
+  bool SwapBuffers(PP_CompletionCallback callback);
+
+  void ViewInitiatedPaint();
+  void ViewFlushedPaint();
 
  private:
   // Called when SwapBuffers is complete.
   void OnSwapBuffers();
 
   // Plugin instance this surface is associated with.
   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_;
 
   DISALLOW_COPY_AND_ASSIGN(PPB_Surface3D_Impl);
 };
 
 }  // namespace ppapi
 }  // namespace webkit
 
 #endif  // WEBKIT_PLUGINS_PPAPI_PPB_SURFACE_3D_IMPL_H_