The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ff4292757230ea9a6095d139c5112fffad9ccb7b

commit ff4292757230ea9a6095d139c5112fffad9ccb7b
Author: Ria Jiang <riajiang@chromium.org>
Date: Thu Jan 11 21:29:45 2018

Change mouse-wheel to use async targeting.

Change mouse-wheel to use mojom::InputTargetClient to do
async targeting.
Separate mouse-wheel event processing and dispatching.
Some changes in RenderWidgetTargeter.


--disable-features=EnablePreventLayerSquashing

Bug:  799473 
Test: test with --site-per-process and
Change-Id: I004abf2183c47ab33c5bbc22dfeb5fe37e244d11
Reviewed-on: https://chromium-review.googlesource.com/854239
Commit-Queue: Ria Jiang <riajiang@chromium.org>
Reviewed-by: James MacLean <wjmaclean@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#528760}
[modify] https://crrev.com/ff4292757230ea9a6095d139c5112fffad9ccb7b/content/browser/renderer_host/render_widget_host_input_event_router.cc
[modify] https://crrev.com/ff4292757230ea9a6095d139c5112fffad9ccb7b/content/browser/renderer_host/render_widget_host_input_event_router.h
[modify] https://crrev.com/ff4292757230ea9a6095d139c5112fffad9ccb7b/content/browser/renderer_host/render_widget_targeter.cc
[modify] https://crrev.com/ff4292757230ea9a6095d139c5112fffad9ccb7b/content/browser/site_per_process_browsertest.cc