Messages needed for webview compositor communication.

content/browser/browser_plugin/browser_plugin_embedder_helper.cc

Index: content/browser/browser_plugin/browser_plugin_embedder_helper.cc
diff --git a/content/browser/browser_plugin/browser_plugin_embedder_helper.cc b/content/browser/browser_plugin/browser_plugin_embedder_helper.cc
index da5e425764148e3fa9f29c3bd0182229cb9ea708..6da82238009b9d1438c4532c4ec83c4af6f70c0f 100644
--- a/content/browser/browser_plugin/browser_plugin_embedder_helper.cc
+++ b/content/browser/browser_plugin/browser_plugin_embedder_helper.cc
@@ -53,6 +53,8 @@ bool BrowserPluginEmbedderHelper::OnMessageReceived(
                         OnSetGuestVisibility)
     IPC_MESSAGE_HANDLER(BrowserPluginHostMsg_DragStatusUpdate,
                         OnDragStatusUpdate)
+    IPC_MESSAGE_HANDLER(BrowserPluginHostMsg_BuffersSwappedACK,
+                        OnSwapBuffersACK)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -131,6 +133,15 @@ void BrowserPluginEmbedderHelper::OnUpdateRectACK(int instance_id,
   embedder_->UpdateRectACK(instance_id, message_id, size);
 }
 
+void BrowserPluginEmbedderHelper::OnSwapBuffersACK(int route_id,
+                                                   int gpu_host_id,
+                                                   uint32 sync_point) {
+  RenderWidgetHostImpl::AcknowledgeBufferPresent(route_id,
+                                                 gpu_host_id,
+                                                 true,
+                                                 sync_point);
+}
+
 void BrowserPluginEmbedderHelper::OnSetFocus(int instance_id, bool focused) {
   embedder_->SetFocus(instance_id, focused);
 }