cc: Allow sending BeginMainFrame before draw or activation

cc/scheduler/scheduler.cc

Index: cc/scheduler/scheduler.cc
diff --git a/cc/scheduler/scheduler.cc b/cc/scheduler/scheduler.cc
index c19dcda5d6cf18d8c40c9aae16bacbf080db0ffa..31272e7d815e4d1c689c55e12788714cb4c7ecc5 100644
--- a/cc/scheduler/scheduler.cc
+++ b/cc/scheduler/scheduler.cc
@@ -303,6 +303,10 @@ void Scheduler::ProcessScheduledActions() {
   client_->DidAnticipatedDrawTimeChange(AnticipatedDrawTime());
 }
 
+bool Scheduler::ActiveTreeNeedsFirstDraw() const {
+  return state_machine_.active_tree_needs_first_draw();
+}
+
 bool Scheduler::WillDrawIfNeeded() const {
   return !state_machine_.PendingDrawsShouldBeAborted();
 }