The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8e446b43685e62ba0064892c485e14011ac9daf7

commit 8e446b43685e62ba0064892c485e14011ac9daf7
Author: wutao <wutao@chromium.org>
Date: Wed Feb 14 17:57:11 2018

cros: Allow client to set custom_frame_view color.

This cl allows client to set custom_frame_view color.
Changes:
1. Add OnWindowPropertyChanged to CustomFrameViewAshWindowStateDelegate.
2. Client can set custom_frame_view color by setting window property
aura::client::kTopViewColor.

Bug:  811159 , 768932
Test: CustomFrameViewAshTest.KTopViewColor and manually test color update.
Change-Id: Ic2306c399b0d4cda88ffb0f96c48a15e3e6f430b
Reviewed-on: https://chromium-review.googlesource.com/912518
Commit-Queue: Tao Wu <wutao@chromium.org>
Reviewed-by: Mitsuru Oshima (In Tokyo) <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536748}
[modify] https://crrev.com/8e446b43685e62ba0064892c485e14011ac9daf7/ash/frame/custom_frame_view_ash.cc
[modify] https://crrev.com/8e446b43685e62ba0064892c485e14011ac9daf7/ash/frame/custom_frame_view_ash.h
[modify] https://crrev.com/8e446b43685e62ba0064892c485e14011ac9daf7/ash/frame/custom_frame_view_ash_unittest.cc
[modify] https://crrev.com/8e446b43685e62ba0064892c485e14011ac9daf7/ash/frame/default_frame_header.cc
[modify] https://crrev.com/8e446b43685e62ba0064892c485e14011ac9daf7/ash/public/cpp/window_properties.cc
[modify] https://crrev.com/8e446b43685e62ba0064892c485e14011ac9daf7/ash/public/cpp/window_properties.h