The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8ee02a33407c0456fcd4dd4ee919f66c12a88669

commit 8ee02a33407c0456fcd4dd4ee919f66c12a88669
Author: riajiang <riajiang@chromium.org>
Date: Tue Oct 11 20:57:40 2016

Fix event dispatching and window resizing in high-dpi mode.

TODO:
1. Currently there are no hover effects for backwards, forwards, refresh
and app menu button.
2. Minimize, Maximize and Close buttons are not receiving events in the
bottom half area, which will be fixed in another CL by changing client_area.

BUG= 646926 ,  646927 
TEST=manual (with --force-device-scale-factor=2)

Review-Url: https://codereview.chromium.org/2341483004
Cr-Commit-Position: refs/heads/master@{#424542}

[modify] https://crrev.com/8ee02a33407c0456fcd4dd4ee919f66c12a88669/ui/aura/window_event_dispatcher.cc
[modify] https://crrev.com/8ee02a33407c0456fcd4dd4ee919f66c12a88669/ui/aura/window_event_dispatcher.h
[modify] https://crrev.com/8ee02a33407c0456fcd4dd4ee919f66c12a88669/ui/views/mus/window_tree_host_mus.cc
[modify] https://crrev.com/8ee02a33407c0456fcd4dd4ee919f66c12a88669/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/075c4290cdfc0cfca43c2114bce282ea9389e6fc

commit 075c4290cdfc0cfca43c2114bce282ea9389e6fc
Author: riajiang <riajiang@chromium.org>
Date: Thu Nov 17 23:13:59 2016

Scale client area, hit test mask and bounds by device_scale_factor.

Fixes the second TODO of CL https://codereview.chromium.org/2341483004/.

TODO:
1. Chrome browser doesn't show up with window bounds scaling.
2. Also scale window bounds in aura::mus::WindowTreeClient once window
bounds work correctly.

BUG= 646926 
TEST=manual (with --force-device-scale-factor=2)

Review-Url: https://codereview.chromium.org/2447303002
Cr-Commit-Position: refs/heads/master@{#433009}

[modify] https://crrev.com/075c4290cdfc0cfca43c2114bce282ea9389e6fc/services/ui/demo/mus_demo.cc
[modify] https://crrev.com/075c4290cdfc0cfca43c2114bce282ea9389e6fc/services/ui/demo/mus_demo.h
[modify] https://crrev.com/075c4290cdfc0cfca43c2114bce282ea9389e6fc/services/ui/public/cpp/tests/BUILD.gn
[modify] https://crrev.com/075c4290cdfc0cfca43c2114bce282ea9389e6fc/services/ui/public/cpp/tests/window_server_test_base.cc
[modify] https://crrev.com/075c4290cdfc0cfca43c2114bce282ea9389e6fc/services/ui/public/cpp/tests/window_server_test_base.h
[modify] https://crrev.com/075c4290cdfc0cfca43c2114bce282ea9389e6fc/services/ui/public/cpp/tests/window_tree_client_unittest.cc
[modify] https://crrev.com/075c4290cdfc0cfca43c2114bce282ea9389e6fc/services/ui/public/cpp/window_tree_client.cc
[modify] https://crrev.com/075c4290cdfc0cfca43c2114bce282ea9389e6fc/services/ui/test_wm/BUILD.gn
[modify] https://crrev.com/075c4290cdfc0cfca43c2114bce282ea9389e6fc/services/ui/test_wm/test_wm.cc
[modify] https://crrev.com/075c4290cdfc0cfca43c2114bce282ea9389e6fc/ui/aura/mus/window_tree_client.cc
[modify] https://crrev.com/075c4290cdfc0cfca43c2114bce282ea9389e6fc/ui/gfx/geometry/dip_util.cc
[modify] https://crrev.com/075c4290cdfc0cfca43c2114bce282ea9389e6fc/ui/gfx/geometry/dip_util.h

Tested in chrome dev #56.0.2924.3 on Windows 10 & Mac 10.12 and observed that

1.Mouse hover effects for backwards, forwards, refresh and app menu button - Working fine.

Could anyone please check and let us know the expected behavior of the issue and please provide any other test cases required to proceed with.

A screen cast is attached which was when performed on Mac OS.

Thank you! 

Deleted: 646926.mp4 2.7 MB

	646926.mp4 2.7 MB View Download

Event dispatching is working fine in non-mash mode (without --mash flag). All these changes are not being used in branch 56.

Great , thanks for the update. Please request a merge to M56 branch when needed.

-label M-56 as it's not going to be on M56.