The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/20e7eba1ee42433ef5e068e58625230ec3d5f1ed

commit 20e7eba1ee42433ef5e068e58625230ec3d5f1ed
Author: fsamuel <fsamuel@chromium.org>
Date: Wed May 18 15:59:43 2016

Delete mus surfaces hit testing

There's a ton of cc plumbing through the window server to
support surfaces hittesting. This code exists to support
out of process iframes but has been disabled for while.
With the mus-ws / mus-gpu split, this code will change
radically anyway. To avoid refactoring dead code, I'm
deleting it first, and we may reintroduce it in mus-gpu in
the future in some new and improved form.

BUG= 612636 , 610937 

Review-Url: https://codereview.chromium.org/1987133002
Cr-Commit-Position: refs/heads/master@{#394432}

[modify] https://crrev.com/20e7eba1ee42433ef5e068e58625230ec3d5f1ed/components/mus/surfaces/surfaces_state.cc
[modify] https://crrev.com/20e7eba1ee42433ef5e068e58625230ec3d5f1ed/components/mus/surfaces/surfaces_state.h
[modify] https://crrev.com/20e7eba1ee42433ef5e068e58625230ec3d5f1ed/components/mus/ws/display.cc
[modify] https://crrev.com/20e7eba1ee42433ef5e068e58625230ec3d5f1ed/components/mus/ws/display.h
[modify] https://crrev.com/20e7eba1ee42433ef5e068e58625230ec3d5f1ed/components/mus/ws/event_dispatcher.cc
[modify] https://crrev.com/20e7eba1ee42433ef5e068e58625230ec3d5f1ed/components/mus/ws/event_dispatcher.h
[modify] https://crrev.com/20e7eba1ee42433ef5e068e58625230ec3d5f1ed/components/mus/ws/platform_display.cc
[modify] https://crrev.com/20e7eba1ee42433ef5e068e58625230ec3d5f1ed/components/mus/ws/platform_display_delegate.h
[modify] https://crrev.com/20e7eba1ee42433ef5e068e58625230ec3d5f1ed/components/mus/ws/window_finder.cc
[modify] https://crrev.com/20e7eba1ee42433ef5e068e58625230ec3d5f1ed/components/mus/ws/window_finder.h
[modify] https://crrev.com/20e7eba1ee42433ef5e068e58625230ec3d5f1ed/components/mus/ws/window_finder_unittest.cc
[modify] https://crrev.com/20e7eba1ee42433ef5e068e58625230ec3d5f1ed/components/mus/ws/window_manager_state.cc
[modify] https://crrev.com/20e7eba1ee42433ef5e068e58625230ec3d5f1ed/components/mus/ws/window_manager_state.h

Assigning to sadrul@ for triage.

Bug scrub: Is this still relevant for mustash?

Not relevant. out-of-process ash needs to use viz hit testing.