cc: Poll for state that triggers draws (synchronous compositor only)

cc/scheduler/scheduler_state_machine.cc

Index: cc/scheduler/scheduler_state_machine.cc
diff --git a/cc/scheduler/scheduler_state_machine.cc b/cc/scheduler/scheduler_state_machine.cc
index a608fb902c74864a3203db522e5f72f367a091eb..009cf4bdb59e61ecaf44ae268efc1359caf24a19 100644
--- a/cc/scheduler/scheduler_state_machine.cc
+++ b/cc/scheduler/scheduler_state_machine.cc
@@ -753,6 +753,10 @@ void SchedulerStateMachine::DidLeaveBeginFrame() {
   inside_begin_frame_ = false;
 }
 
+void SchedulerStateMachine::PollForAnticipatedDrawTriggers() {
+  current_frame_number_++;
+}
+
 void SchedulerStateMachine::SetVisible(bool visible) { visible_ = visible; }
 
 void SchedulerStateMachine::SetNeedsRedraw() { needs_redraw_ = true; }