Make SingleThreadProxy a SchedulerClient

content/renderer/render_widget.cc

 // Copyright (c) 2012 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.
 
 #include "content/renderer/render_widget.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/debug/trace_event_synthetic_delay.h"
@@ skipping 1861 matching lines @@
 }
 
 void RenderWidget::suppressCompositorScheduling(bool enable) {
   if (compositor_)
     compositor_->SetSuppressScheduleComposite(enable);
 }
 
 void RenderWidget::willBeginCompositorFrame() {
   TRACE_EVENT0("gpu", "RenderWidget::willBeginCompositorFrame");
 
-  DCHECK(RenderThreadImpl::current()->compositor_message_loop_proxy().get());
+  // TODO(enne): remove this when DoDeferredUpdate goes away.
+  if (!RenderThreadImpl::current()->compositor_message_loop_proxy().get())
+    return;
 
   // The following two can result in further layout and possibly
   // enable GPU acceleration so they need to be called before any painting
   // is done.
   UpdateTextInputType();
 #if defined(OS_ANDROID)
   UpdateTextInputState(false, true);
 #endif
   UpdateSelectionBounds();
 }
@@ skipping 893 matching lines @@
 
 void RenderWidget::RegisterSwappedOutChildFrame(RenderFrameImpl* frame) {
   swapped_out_frames_.AddObserver(frame);
 }
 
 void RenderWidget::UnregisterSwappedOutChildFrame(RenderFrameImpl* frame) {
   swapped_out_frames_.RemoveObserver(frame);
 }
 
 }  // namespace content