cc: modify the waiting condition of forced commit

cc/scheduler/scheduler.cc

Index: cc/scheduler/scheduler.cc
diff --git a/cc/scheduler/scheduler.cc b/cc/scheduler/scheduler.cc
index 6555e82e91e2965b3b5c2ede90933d4bc5180123..bf4a6fa1d2088a685072c8c4a59512cc6163ae59 100644
--- a/cc/scheduler/scheduler.cc
+++ b/cc/scheduler/scheduler.cc
@@ -294,6 +294,11 @@ void Scheduler::PollForAnticipatedDrawTriggers() {
   state_machine_.DidLeavePollForAnticipatedDrawTriggers();
 }
 
+bool Scheduler::IsBeginMainFrameSent() const {
+  return state_machine_.commit_state() ==
+         SchedulerStateMachine::COMMIT_STATE_BEGIN_MAIN_FRAME_SENT;
+}
+
 void Scheduler::DrawAndSwapIfPossible() {
   DrawSwapReadbackResult result =
       client_->ScheduledActionDrawAndSwapIfPossible();