cc: Implement deadine scheduling disabled by default

ui/compositor/compositor.cc

Index: ui/compositor/compositor.cc
diff --git a/ui/compositor/compositor.cc b/ui/compositor/compositor.cc
index 389002d4322a54b94f29712a5caedcf56f77f1b8..4e51763c8cefa71d03149955f4c2b90ecc597916 100644
--- a/ui/compositor/compositor.cc
+++ b/ui/compositor/compositor.cc
@@ -385,6 +385,8 @@ Compositor::Compositor(CompositorDelegate* delegate,
       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 =
@@ -532,6 +534,10 @@ void Compositor::Terminate() {
   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());