cc: Implement deadine scheduling disabled by default

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 367 matching lines @@
   root_web_layer_ = cc::Layer::Create();
   root_web_layer_->SetAnchorPoint(gfx::PointF(0.f, 0.f));
 
   CommandLine* command_line = CommandLine::ForCurrentProcess();
 
   cc::LayerTreeSettings settings;
   settings.refresh_rate =
       ContextFactory::GetInstance()->DoesCreateTestContexts()
       ? kTestRefreshRate
       : kDefaultRefreshRate;
+  settings.deadline_scheduling_enabled =
+      cc::switches::IsDeadlineSchedulingEnabled();
   settings.partial_swap_enabled =
       !command_line->HasSwitch(cc::switches::kUIDisablePartialSwap);
   settings.per_tile_painting_enabled =
       command_line->HasSwitch(cc::switches::kUIEnablePerTilePainting);
 
   // These flags should be mirrored by renderer versions in content/renderer/.
   settings.initial_debug_state.show_debug_borders =
       command_line->HasSwitch(cc::switches::kUIShowCompositedLayerBorders);
   settings.initial_debug_state.show_fps_counter =
       command_line->HasSwitch(cc::switches::kUIShowFPSCounter);
@@ skipping 127 matching lines @@
         << "The ContextFactory should not outlive the compositor thread.";
     g_compositor_thread->Stop();
     delete g_compositor_thread;
     g_compositor_thread = NULL;
   }
 
   DCHECK(g_compositor_initialized) << "Compositor::Initialize() didn't happen.";
   g_compositor_initialized = false;
 }
 
+const cc::LayerTreeSettings& Compositor::layer_tree_settings() const {
+  return host_->settings();
+}
+
 void Compositor::ScheduleDraw() {
   if (g_compositor_thread)
     host_->Composite(base::TimeTicks::Now());
   else if (delegate_)
     delegate_->ScheduleDraw();
 }
 
 void Compositor::SetRootLayer(Layer* root_layer) {
   if (root_layer_ == root_layer)
     return;
@@ skipping 225 matching lines @@
 }
 
 void Compositor::NotifyEnd() {
   last_ended_frame_++;
   FOR_EACH_OBSERVER(CompositorObserver,
                     observer_list_,
                     OnCompositingEnded(this));
 }
 
 }  // namespace ui