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 c2cb977fd1e4c3623f3da0023564bc7a7497cf17..c80d9cc0641faae7c69776d81be29aaee39e80cc 100644
--- a/cc/scheduler/scheduler_state_machine.cc
+++ b/cc/scheduler/scheduler_state_machine.cc
@@ -769,6 +769,13 @@ bool SchedulerStateMachine::ProactiveBeginFrameWantedByImplThread() const {
   if (needs_manage_tiles_)
     return true;
 
+  // If we just swapped, it's likely that we are going to produce another
+  // frame soon. This helps avoid negative glitches in our SetNeedsBeginFrame
+  // requests, which may propagate to the BeginFrame provider and get sampled
+  // at an inopportune time, delaying the next BeginFrame.
+  if (last_frame_number_swap_performed_ == current_frame_number_)
+    return true;
+
   return false;
 }