The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9b0a69b5dbaca8c92d037e22016bc398b155891a

commit 9b0a69b5dbaca8c92d037e22016bc398b155891a
Author: Sadrul Habib Chowdhury <sadrul@chromium.org>
Date: Mon Jan 08 03:23:22 2018

oopif events: Merge hit-testing impls for all platforms into one.

The draw-quad-based hit-testing code was implemented separately for the
aura, mac, and android platforms. But the code is essentially the same.
So unify the implementation in base RenderWidgetHostViewBase class, so
that all platforms can use the same code.

BUG= 796651 

Change-Id: I3927775073f5b608e88ced5c519f75e0ef1494db
Reviewed-on: https://chromium-review.googlesource.com/852807
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#527560}
[modify] https://crrev.com/9b0a69b5dbaca8c92d037e22016bc398b155891a/content/browser/renderer_host/delegated_frame_host.cc
[modify] https://crrev.com/9b0a69b5dbaca8c92d037e22016bc398b155891a/content/browser/renderer_host/delegated_frame_host.h
[modify] https://crrev.com/9b0a69b5dbaca8c92d037e22016bc398b155891a/content/browser/renderer_host/render_widget_host_view_android.cc
[modify] https://crrev.com/9b0a69b5dbaca8c92d037e22016bc398b155891a/content/browser/renderer_host/render_widget_host_view_android.h
[modify] https://crrev.com/9b0a69b5dbaca8c92d037e22016bc398b155891a/content/browser/renderer_host/render_widget_host_view_aura.cc
[modify] https://crrev.com/9b0a69b5dbaca8c92d037e22016bc398b155891a/content/browser/renderer_host/render_widget_host_view_aura.h
[modify] https://crrev.com/9b0a69b5dbaca8c92d037e22016bc398b155891a/content/browser/renderer_host/render_widget_host_view_aura_unittest.cc
[modify] https://crrev.com/9b0a69b5dbaca8c92d037e22016bc398b155891a/content/browser/renderer_host/render_widget_host_view_base.cc
[modify] https://crrev.com/9b0a69b5dbaca8c92d037e22016bc398b155891a/content/browser/renderer_host/render_widget_host_view_base.h
[modify] https://crrev.com/9b0a69b5dbaca8c92d037e22016bc398b155891a/content/browser/renderer_host/render_widget_host_view_child_frame.cc
[modify] https://crrev.com/9b0a69b5dbaca8c92d037e22016bc398b155891a/content/browser/renderer_host/render_widget_host_view_child_frame.h
[modify] https://crrev.com/9b0a69b5dbaca8c92d037e22016bc398b155891a/content/browser/renderer_host/render_widget_host_view_mac.h
[modify] https://crrev.com/9b0a69b5dbaca8c92d037e22016bc398b155891a/content/browser/renderer_host/render_widget_host_view_mac.mm
[modify] https://crrev.com/9b0a69b5dbaca8c92d037e22016bc398b155891a/content/public/test/browser_test_utils.cc
[modify] https://crrev.com/9b0a69b5dbaca8c92d037e22016bc398b155891a/content/test/test_render_view_host.cc
[modify] https://crrev.com/9b0a69b5dbaca8c92d037e22016bc398b155891a/content/test/test_render_view_host.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/89122ef0bd79bc79174e9ee50f622dd9d24200de

commit 89122ef0bd79bc79174e9ee50f622dd9d24200de
Author: Sadrul Habib Chowdhury <sadrul@chromium.org>
Date: Wed Jan 10 19:45:03 2018

oopif events: Improve some of the hit-testing related tests.

. Code unification for some tests that involve dispatching a mouse-down
  event to a view at a certain location, and validating that the event
  reaches the desired target view at the desired location.
. Add a browser-test for layer squashing: if layer-squashing causes parts
  of a layer in the embedder to overlap the oopif, the events on top of
  that layer should still reach the oopif.
. Add a browser-test for watermarking: if a translucent div on the main
  page is overlapping the oopif, with pointer-events: none, then the
  oopif should receive events correctly.

BUG= 796651 

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Idbc2bc793584874d4fc8aebca78e32669a492826
Reviewed-on: https://chromium-review.googlesource.com/853699
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: James MacLean <wjmaclean@chromium.org>
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#528387}
[modify] https://crrev.com/89122ef0bd79bc79174e9ee50f622dd9d24200de/content/browser/renderer_host/render_widget_host_view_base.cc
[modify] https://crrev.com/89122ef0bd79bc79174e9ee50f622dd9d24200de/content/browser/site_per_process_browsertest.cc
[add] https://crrev.com/89122ef0bd79bc79174e9ee50f622dd9d24200de/content/test/data/frame_tree/oopif_hit_test_layer_squashing.html
[add] https://crrev.com/89122ef0bd79bc79174e9ee50f622dd9d24200de/content/test/data/frame_tree/oopif_hit_test_watermark.html
[modify] https://crrev.com/89122ef0bd79bc79174e9ee50f622dd9d24200de/testing/buildbot/filters/viz.content_browsertests.filter

sadrul@: Can this be marked fixed now?  I see all the blocking bugs are closed.

This can now be fixed, yep!

Sadrul, do we have a bug tracking the full adoption of Viz hit testing for OOPIFs? I can file one if not.

The full viz-hitesting with OOP-D is issue 672311

For non-OOPD, there are some relevant bugs:  issue 805581 ,  issue 806144 ,  issue 732399  etc. It would make sense to create a meta-bug for viz-assisted hit-test in content without OOP-D with these as blocking bugs.

I found an existing bug that fits the description: issue 780279.