CL is up: https://chromium-review.googlesource.com/c/chromium/src/+/840644

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/772561ba831fa2ca15e0da4b34b0fcd977792d31

commit 772561ba831fa2ca15e0da4b34b0fcd977792d31
Author: Ken Buchanan <kenrb@chromium.org>
Date: Fri Dec 22 16:15:23 2017

Browser quad-based hit testing returns confidence level

This CL adds an output bool to the quad-based hit testing APIs to
SurfaceHitTest. When the bool is true, it means that there is reduced
confidence in the hit test result being returned, and the caller should
invoke InputTargetClient to perform an asynchronous hit test in the
renderer before routing a given input event.

Bug:  796648 
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I5d5f4bf18977a85c5e4d7f4c4291a4ec89bca70f
Reviewed-on: https://chromium-review.googlesource.com/840644
Commit-Queue: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Lucas Gadani <lfg@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526003}
[modify] https://crrev.com/772561ba831fa2ca15e0da4b34b0fcd977792d31/components/viz/service/surfaces/surface_hittest.cc
[modify] https://crrev.com/772561ba831fa2ca15e0da4b34b0fcd977792d31/components/viz/service/surfaces/surface_hittest.h
[modify] https://crrev.com/772561ba831fa2ca15e0da4b34b0fcd977792d31/components/viz/service/surfaces/surface_hittest_unittest.cc
[modify] https://crrev.com/772561ba831fa2ca15e0da4b34b0fcd977792d31/content/browser/renderer_host/delegated_frame_host.cc
[modify] https://crrev.com/772561ba831fa2ca15e0da4b34b0fcd977792d31/content/browser/renderer_host/delegated_frame_host.h
[modify] https://crrev.com/772561ba831fa2ca15e0da4b34b0fcd977792d31/content/browser/renderer_host/render_widget_host_input_event_router.cc
[modify] https://crrev.com/772561ba831fa2ca15e0da4b34b0fcd977792d31/content/browser/renderer_host/render_widget_host_input_event_router_unittest.cc
[modify] https://crrev.com/772561ba831fa2ca15e0da4b34b0fcd977792d31/content/browser/renderer_host/render_widget_host_view_android.cc
[modify] https://crrev.com/772561ba831fa2ca15e0da4b34b0fcd977792d31/content/browser/renderer_host/render_widget_host_view_android.h
[modify] https://crrev.com/772561ba831fa2ca15e0da4b34b0fcd977792d31/content/browser/renderer_host/render_widget_host_view_aura.cc
[modify] https://crrev.com/772561ba831fa2ca15e0da4b34b0fcd977792d31/content/browser/renderer_host/render_widget_host_view_aura.h
[modify] https://crrev.com/772561ba831fa2ca15e0da4b34b0fcd977792d31/content/browser/renderer_host/render_widget_host_view_base.cc
[modify] https://crrev.com/772561ba831fa2ca15e0da4b34b0fcd977792d31/content/browser/renderer_host/render_widget_host_view_base.h
[modify] https://crrev.com/772561ba831fa2ca15e0da4b34b0fcd977792d31/content/browser/renderer_host/render_widget_host_view_mac.h
[modify] https://crrev.com/772561ba831fa2ca15e0da4b34b0fcd977792d31/content/browser/renderer_host/render_widget_host_view_mac.mm