Trackpad scrolling could lag on MacOSX

content/browser/renderer_host/input/gesture_event_queue.h

Index: content/browser/renderer_host/input/gesture_event_queue.h
diff --git a/content/browser/renderer_host/input/gesture_event_queue.h b/content/browser/renderer_host/input/gesture_event_queue.h
index 41faa3618351a4a715ebb4f347844a41dc077da8..c619a04cad0d7d8d32f6e15b65018111f7aad6a7 100644
--- a/content/browser/renderer_host/input/gesture_event_queue.h
+++ b/content/browser/renderer_host/input/gesture_event_queue.h
@@ -117,6 +117,8 @@ class CONTENT_EXPORT GestureEventQueue {
   friend class GestureEventQueueTest;
   friend class MockRenderWidgetHost;
 
+  bool FilterScrollBegin(const GestureEventWithLatencyInfo& gesture_event);

[tdresser, 2016/05/02 13:27:15]

The name |FilterScrollBegin| makes me think we'll just decide what to do with
the scroll begin event, whereas we actually remove the previous scroll end.

Maybe just OnScrollBegin?
Or you could move the synthetic check, and have it be OnSyntheticScrollBegin?

[dtapuska, 2016/05/02 13:57:25]

Done.

+
   // TODO(mohsen): There are a bunch of ShouldForward.../ShouldDiscard...
   // methods that are getting confusing. This should be somehow fixed. Maybe
   // while refactoring GEQ: http://crbug.com/148443.