phase based wheel scroll latching for mac

content/browser/renderer_host/render_widget_host_view_mac.h

Index: content/browser/renderer_host/render_widget_host_view_mac.h
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.h b/content/browser/renderer_host/render_widget_host_view_mac.h
index ac198a442454506a9caf84b3b7a029576ba257cf..fd01726a99c4944b4f4bfae66fe94ccd5a0958d3 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.h
+++ b/content/browser/renderer_host/render_widget_host_view_mac.h
@@ -487,6 +487,14 @@ class CONTENT_EXPORT RenderWidgetHostViewMac
   // Get the focused view that should be used for retrieving the text selection.
   RenderWidgetHostViewBase* GetFocusedViewForTextSelection();
 
+  base::OneShotTimer mouse_wheel_end_dispatch_timer_;
+
+  void SendSyntheticWheelEventWithPhaseEnded(
+      blink::WebMouseWheelEvent wheel_event,
+      bool should_route_event);
+  void StartMouseWheelEndDispatchTimer(blink::WebMouseWheelEvent wheel_event,
+                                       bool should_route_event);

[tdresser, 2017/05/25 19:34:48]

Since this is public, we might not want to refer to the implementation detail of
this starting the timer, but should refer to what the method does and when to
call it.

Something like QueueMouseWheelEnd, or MouseWheelMaybeFlinging or something like
that.

[sahel, 2017/05/26 18:03:25]

Done.

+
   // Returns the RenderWidgetHostDelegate corresponding to the currently focused
   // RenderWidgetHost. It is different from |render_widget_host_->delegate()|
   // when there are focused inner WebContentses on the page. Also, this method