Use inner HWND for accelerated rendering on windows

chrome/browser/renderer_host/render_widget_host.cc

Index: chrome/browser/renderer_host/render_widget_host.cc
===================================================================
--- chrome/browser/renderer_host/render_widget_host.cc	(revision 65702)
+++ chrome/browser/renderer_host/render_widget_host.cc	(working copy)
@@ -180,6 +180,9 @@
                         OnMsgCreatePluginContainer)
     IPC_MESSAGE_HANDLER(ViewHostMsg_DestroyPluginContainer,
                         OnMsgDestroyPluginContainer)
+#elif defined(OS_WIN)
+    IPC_MESSAGE_HANDLER(ViewHostMsg_ShowCompositorHostWindow,
+                        OnShowCompositorHostWindow)
 #endif
     IPC_MESSAGE_UNHANDLED_ERROR()
   IPC_END_MESSAGE_MAP_EX()
@@ -372,8 +375,9 @@
 }
 
 void RenderWidgetHost::ScheduleComposite() {
-  DCHECK(!is_hidden_ || !is_gpu_rendering_active_) <<
-      "ScheduleCompositeAndSync called while hidden!";
+  if (!is_hidden_ || !is_gpu_rendering_active_) {
+      return;
+  }
 
   // Send out a request to the renderer to paint the view if required.
   if (!repaint_ack_pending_ && !resize_ack_pending_ && !view_being_painted_) {
@@ -1041,7 +1045,14 @@
     NOTIMPLEMENTED();
   }
 }
-
+#elif defined(OS_WIN)
+void RenderWidgetHost::OnShowCompositorHostWindow(bool show) {
+  if (view_) {
+    view_->ShowCompositorHostWindow(show);
+  } else {
+    NOTIMPLEMENTED();
+  }
+}
 #endif
 
 void RenderWidgetHost::PaintBackingStoreRect(