Make SingleThreadProxy a SchedulerClient

ui/compositor/compositor.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 "ui/compositor/compositor.h"
 
 #include <algorithm>
 #include <deque>
 
 #include "base/bind.h"
@@ skipping 118 matching lines @@
   settings.initial_debug_state.show_occluding_rects =
       command_line->HasSwitch(cc::switches::kUIShowOccludingRects);
   settings.initial_debug_state.show_non_occluding_rects =
       command_line->HasSwitch(cc::switches::kUIShowNonOccludingRects);
 
   settings.initial_debug_state.SetRecordRenderingStats(
       command_line->HasSwitch(cc::switches::kEnableGpuBenchmarking));
 
   settings.impl_side_painting = IsUIImplSidePaintingEnabled();
   settings.use_zero_copy = IsUIZeroCopyEnabled();
+  settings.single_thread_proxy_scheduler = false;
 
   base::TimeTicks before_create = base::TimeTicks::Now();
   if (compositor_thread_loop_) {
     host_ = cc::LayerTreeHost::CreateThreaded(
         this,
         context_factory_->GetSharedBitmapManager(),
         settings,
         task_runner_,
         compositor_thread_loop_);
   } else {
@@ skipping 290 matching lines @@
     // Call ScheduleDraw() instead of Draw() in order to allow other
     // CompositorObservers to be notified before starting another
     // draw cycle.
     ScheduleDraw();
   }
   FOR_EACH_OBSERVER(
       CompositorObserver, observer_list_, OnCompositingEnded(this));
 }
 
 }  // namespace ui