cc: Making BeginFrameSources support multiple BeginFrameObservers.

cc/scheduler/scheduler.cc

Index: cc/scheduler/scheduler.cc
diff --git a/cc/scheduler/scheduler.cc b/cc/scheduler/scheduler.cc
index 68214cd96b762f5ba0c96581f6ba0c0fb00c1a38..1801c802866ee47d2a2b64f09142ea8c50827ed0 100644
--- a/cc/scheduler/scheduler.cc
+++ b/cc/scheduler/scheduler.cc
@@ -734,15 +734,15 @@ void Scheduler::ProcessScheduledActions() {
   SetupNextBeginFrameIfNeeded();
 }
 
-scoped_refptr<base::trace_event::ConvertableToTraceFormat> Scheduler::AsValue()
-    const {
+scoped_refptr<base::trace_event::ConvertableToTraceFormat>
+Scheduler::AsValue() {
   scoped_refptr<base::trace_event::TracedValue> state =
       new base::trace_event::TracedValue();
   AsValueInto(state.get());
   return state;
 }
 
-void Scheduler::AsValueInto(base::trace_event::TracedValue* state) const {
+void Scheduler::AsValueInto(base::trace_event::TracedValue* state) {
   state->BeginDictionary("state_machine");
   state_machine_.AsValueInto(state);
   state->EndDictionary();
@@ -809,7 +809,7 @@ void Scheduler::AsValueInto(base::trace_event::TracedValue* state) const {
   state->EndDictionary();
 }
 
-bool Scheduler::CanCommitAndActivateBeforeDeadline() const {
+bool Scheduler::CanCommitAndActivateBeforeDeadline() {
   // Check if the main thread computation and commit can be finished before the
   // impl thread's deadline.
   base::TimeTicks estimated_draw_time =