The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/43624d14130e30730e344a897c2f62f89ff4d33d

commit 43624d14130e30730e344a897c2f62f89ff4d33d
Author: smcgruer <smcgruer@chromium.org>
Date: Thu Feb 16 20:36:25 2017

Force compositing/overflow/composited-sticky-element to be composited

This test was relying on opaque backgrounds to cause the elements to be
promoted, which is not correct. Since the condition under test is just
to have a composited sticky element in a composited scroller, mark them
both will-change: transform instead.

BUG= 693158 

Review-Url: https://codereview.chromium.org/2705453002
Cr-Commit-Position: refs/heads/master@{#451089}

[modify] https://crrev.com/43624d14130e30730e344a897c2f62f89ff4d33d/third_party/WebKit/LayoutTests/compositing/overflow/composited-sticky-element-expected.html
[modify] https://crrev.com/43624d14130e30730e344a897c2f62f89ff4d33d/third_party/WebKit/LayoutTests/compositing/overflow/composited-sticky-element.html