cc: Remove retro frames from scheduler.

cc/trees/single_thread_proxy.cc

 // Copyright 2011 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 "cc/trees/single_thread_proxy.h"
 
 #include "base/auto_reset.h"
 #include "base/memory/ptr_util.h"
 #include "base/profiler/scoped_tracker.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 875 matching lines @@
                                                TopControlsState current,
                                                bool animate) {
   NOTREACHED() << "Top Controls are used only in threaded mode";
 }
 
 void SingleThreadProxy::SetOutputIsSecure(bool output_is_secure) {
   layer_tree_host_impl_->set_output_is_secure(output_is_secure);
 }
 
 void SingleThreadProxy::DidFinishImplFrame() {
-  layer_tree_host_impl_->DidFinishImplFrame();
 #if DCHECK_IS_ON()
   DCHECK(inside_impl_frame_)
       << "DidFinishImplFrame called while not inside an impl frame!";
   inside_impl_frame_ = false;
 #endif
+  layer_tree_host_impl_->DidFinishImplFrame();
 }
 
 void SingleThreadProxy::SendBeginFramesToChildren(const BeginFrameArgs& args) {
   layer_tree_host_->SendBeginFramesToChildren(args);
 }
 
 }  // namespace cc