cc: Introduce forward_begin_frames_to_children and use_external_begin_frame_source

cc/scheduler/scheduler_settings.cc

Index: cc/scheduler/scheduler_settings.cc
diff --git a/cc/scheduler/scheduler_settings.cc b/cc/scheduler/scheduler_settings.cc
index ab9add087bd9f32bca15c18081d18688ac1d4d9c..81a57f1b01362ff0bf7cb6ed0808a0299c81fff5 100644
--- a/cc/scheduler/scheduler_settings.cc
+++ b/cc/scheduler/scheduler_settings.cc
@@ -10,7 +10,8 @@
 namespace cc {
 
 SchedulerSettings::SchedulerSettings()
-    : begin_frame_scheduling_enabled(true),
+    : begin_frame_receiver(true),

[piman, 2014/11/05 00:39:14]

nit: it would be good to have the same default here and in LayerTreeSettings.
Less confusion.

[simonhong, 2014/11/10 13:18:08]

Done.

+      begin_frame_publisher(false),
       main_frame_before_activation_enabled(false),
       impl_side_painting(false),
       timeout_and_draw_when_animation_checkerboards(true),
@@ -21,7 +22,8 @@ SchedulerSettings::SchedulerSettings()
 }
 
 SchedulerSettings::SchedulerSettings(const LayerTreeSettings& settings)
-    : begin_frame_scheduling_enabled(settings.begin_frame_scheduling_enabled),
+    : begin_frame_receiver(settings.begin_frame_receiver),
+      begin_frame_publisher(settings.begin_frame_publisher),
       main_frame_before_activation_enabled(
           settings.main_frame_before_activation_enabled),
       impl_side_painting(settings.impl_side_painting),
@@ -42,8 +44,8 @@ scoped_refptr<base::debug::ConvertableToTraceFormat>
 SchedulerSettings::AsValue() const {
   scoped_refptr<base::debug::TracedValue> state =
       new base::debug::TracedValue();
-  state->SetBoolean("begin_frame_scheduling_enabled",
-                    begin_frame_scheduling_enabled);
+  state->SetBoolean("begin_frame_receiver", begin_frame_receiver);
+  state->SetBoolean("begin_frame_publisher", begin_frame_publisher);
   state->SetBoolean("main_frame_before_activation_enabled",
                     main_frame_before_activation_enabled);
   state->SetBoolean("impl_side_painting", impl_side_painting);