cc: Always use SetNeedsBeginFrame to request the next BeginFrame

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 009cf4bdb59e61ecaf44ae268efc1359caf24a19..7b0ceca166023d5755f77592a40a4f97b0093fae 100644
--- a/cc/scheduler/scheduler_state_machine.cc
+++ b/cc/scheduler/scheduler_state_machine.cc
@@ -740,6 +740,11 @@ bool SchedulerStateMachine::ProactiveBeginFrameWantedByImplThread() const {
   if (has_pending_tree_)
     return true;
 
+  // If we just swapped, it's likely that we are going to produce another
+  // frame soon.
+  if (last_frame_number_swap_performed_ == current_frame_number_)
+    return true;
+
   return false;
 }