The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b42c8c63669fd9128aa6354abc62aed0a569e1ae

commit b42c8c63669fd9128aa6354abc62aed0a569e1ae
Author: W. James MacLean <wjmaclean@chromium.org>
Date: Wed Jan 10 19:11:18 2018

Refactor RouteTouchEvent to match RenderWidgetTargeter architecture.

This CL is a pure re-factor to break up
RenderWidgetHostInputEventRouter::RouteTouchEvent match the pattern of
FindXEventTarget/DispatchXEvent used by RenderWidgetTargeter.

In the process, we've removed some some duplicated code, and generalized
the event transformations to avoid the over-simplistic static-delta
offset model used previously.

Bug:  799474 
Change-Id: I11cb9e7d56dc3a9c06e00eb844fcb55298ad17c0
Reviewed-on: https://chromium-review.googlesource.com/855118
Commit-Queue: James MacLean <wjmaclean@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#528375}
[modify] https://crrev.com/b42c8c63669fd9128aa6354abc62aed0a569e1ae/content/browser/renderer_host/render_widget_host_input_event_router.cc
[modify] https://crrev.com/b42c8c63669fd9128aa6354abc62aed0a569e1ae/content/browser/renderer_host/render_widget_host_input_event_router.h
[modify] https://crrev.com/b42c8c63669fd9128aa6354abc62aed0a569e1ae/content/browser/renderer_host/render_widget_host_input_event_router_unittest.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/18a151ec456d68e63c632907001a6f427fd889fd

commit 18a151ec456d68e63c632907001a6f427fd889fd
Author: W. James MacLean <wjmaclean@chromium.org>
Date: Wed Jan 10 20:04:14 2018

Refactor RouteTouchcreenGestureEvent() to match RenderWidgetTargeter.

This CL refactors RWHIER::RouteTouchscreenGestureEvent() logic into the
FindTouchscreenGestureEventTarget() /
DispatchTouchscreenGestureEventTarget()
pattern needed to use it with RenderWidgetTargeter.

Bug:  799474 
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I7b09073b69e2812e2c0aafcd4fa4d47dbf30b9a2
Reviewed-on: https://chromium-review.googlesource.com/857417
Commit-Queue: James MacLean <wjmaclean@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#528401}
[modify] https://crrev.com/18a151ec456d68e63c632907001a6f427fd889fd/content/browser/renderer_host/render_widget_host_input_event_router.cc
[modify] https://crrev.com/18a151ec456d68e63c632907001a6f427fd889fd/content/browser/renderer_host/render_widget_host_input_event_router.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/da13bef77e0585eb28a86fca3a6bd130afcb4a3f

commit da13bef77e0585eb28a86fca3a6bd130afcb4a3f
Author: W. James MacLean <wjmaclean@chromium.org>
Date: Fri Jan 12 18:45:40 2018

Enable async Touch/Gesture hit testing.

This CL adds the RenderWidgetTargeter plumbing to enable async hit
testing for touch and gesture events.

Bug:  799474 
Change-Id: I3a6cad3cfae0aae7778c4ac9e52f2765f4728b26
Reviewed-on: https://chromium-review.googlesource.com/860338
Commit-Queue: James MacLean <wjmaclean@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#529005}
[modify] https://crrev.com/da13bef77e0585eb28a86fca3a6bd130afcb4a3f/chrome/browser/apps/guest_view/web_view_browsertest.cc
[modify] https://crrev.com/da13bef77e0585eb28a86fca3a6bd130afcb4a3f/content/browser/renderer_host/render_widget_host_input_event_router.cc
[modify] https://crrev.com/da13bef77e0585eb28a86fca3a6bd130afcb4a3f/content/browser/renderer_host/render_widget_targeter.cc
[modify] https://crrev.com/da13bef77e0585eb28a86fca3a6bd130afcb4a3f/content/browser/site_per_process_browsertest.cc

Assuming the three CLs above stick, this should be fixed now.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ed1f011d02f001dc643338cc5eed086f153f4204

commit ed1f011d02f001dc643338cc5eed086f153f4204
Author: Ria Jiang <riajiang@chromium.org>
Date: Fri Jan 12 21:13:01 2018

Change touchpad-gesture to use async targeting.

Change touchpad-gesture to use mojom::InputTargetClient to do async
targeting.

Bug:  799474 
Test: content_browsertests
Change-Id: I8b3ea653a72d12a0aa9d181d4a62c6c9afc6980f
Reviewed-on: https://chromium-review.googlesource.com/862632
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: James MacLean <wjmaclean@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Commit-Queue: Ria Jiang <riajiang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#529068}
[modify] https://crrev.com/ed1f011d02f001dc643338cc5eed086f153f4204/content/browser/renderer_host/render_widget_host_input_event_router.cc
[modify] https://crrev.com/ed1f011d02f001dc643338cc5eed086f153f4204/content/browser/renderer_host/render_widget_host_input_event_router.h
[modify] https://crrev.com/ed1f011d02f001dc643338cc5eed086f153f4204/content/browser/renderer_host/render_widget_targeter.cc
[modify] https://crrev.com/ed1f011d02f001dc643338cc5eed086f153f4204/content/browser/site_per_process_browsertest.cc
[modify] https://crrev.com/ed1f011d02f001dc643338cc5eed086f153f4204/content/browser/site_per_process_mac_browsertest.mm

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6b841e233df961f906aafc18b7d5a7a830318fe7

commit 6b841e233df961f906aafc18b7d5a7a830318fe7
Author: Ria Jiang <riajiang@chromium.org>
Date: Thu Jan 18 14:33:00 2018

Use RenderWidgetTargeter for touchscreen gesture events.

Unifying code paths between touchscreen gesture events and
other types of events by updating touchscreen to use
RenderWidgetTargeter. Event targeting and dispatching should
still be synchronous, which is why tests don't need to be
updated.

Bug:  799474 
Change-Id: Icd2f2aa59dbfe2e9515150d58481033f09eebe39
Reviewed-on: https://chromium-review.googlesource.com/872094
Commit-Queue: Ria Jiang <riajiang@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: James MacLean <wjmaclean@chromium.org>
Cr-Commit-Position: refs/heads/master@{#530138}
[modify] https://crrev.com/6b841e233df961f906aafc18b7d5a7a830318fe7/content/browser/renderer_host/render_widget_host_input_event_router.cc