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 30185e31d3ebf7d246a0de58b51dc90ae869cc82..90e04e829317e29b4787bdc21b2e298376c51e31 100644
--- a/content/browser/browser_plugin/browser_plugin_embedder_helper.cc
+++ b/content/browser/browser_plugin/browser_plugin_embedder_helper.cc
@@ -56,6 +56,8 @@ bool BrowserPluginEmbedderHelper::OnMessageReceived(
     IPC_MESSAGE_HANDLER(BrowserPluginHostMsg_SetAutoSize, OnSetAutoSize)
     IPC_MESSAGE_HANDLER(BrowserPluginHostMsg_PluginAtPositionResponse,
                         OnPluginAtPositionResponse)
+    IPC_MESSAGE_HANDLER(BrowserPluginHostMsg_BuffersSwappedACK,
+                        OnSwapBuffersACK)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -129,6 +131,15 @@ void BrowserPluginEmbedderHelper::OnUpdateRectACK(
                            resize_guest_params);
 }
 
+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);
 }