Keep vsync enabled while there is a pending requestAnimationFrame

cc/scheduler/scheduler.cc

Index: cc/scheduler/scheduler.cc
diff --git a/cc/scheduler/scheduler.cc b/cc/scheduler/scheduler.cc
index b088a0fc1ae7a8a6d164876d92f345791eb6b82d..892efed06df370ae446b5c04e0abeb999ae75def 100644
--- a/cc/scheduler/scheduler.cc
+++ b/cc/scheduler/scheduler.cc
@@ -50,6 +50,11 @@ void Scheduler::SetNeedsCommit() {
   ProcessScheduledActions();
 }
 
+void Scheduler::SetAnimateRequested() {
+  state_machine_.SetAnimateRequested();
+  ProcessScheduledActions();
+}
+
 void Scheduler::SetNeedsForcedCommit() {
   state_machine_.SetNeedsCommit();
   state_machine_.SetNeedsForcedCommit();