The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/fe6f35b2483e35bcd3e8c775b6810eab2e1e3be3

commit fe6f35b2483e35bcd3e8c775b6810eab2e1e3be3
Author: newcomer <newcomer@chromium.org>
Date: Fri Jul 14 21:06:41 2017

Added a nested class to gfx::Animation

The new class is a reimplementation of SlideAnimation::TestApi which
allows tests to manipulate animations.

BUG= 741076 

Review-Url: https://codereview.chromium.org/2976873003
Cr-Commit-Position: refs/heads/master@{#486887}

[modify] https://crrev.com/fe6f35b2483e35bcd3e8c775b6810eab2e1e3be3/ui/gfx/BUILD.gn
[modify] https://crrev.com/fe6f35b2483e35bcd3e8c775b6810eab2e1e3be3/ui/gfx/animation/animation.h
[add] https://crrev.com/fe6f35b2483e35bcd3e8c775b6810eab2e1e3be3/ui/gfx/animation/animation_test_api.cc
[add] https://crrev.com/fe6f35b2483e35bcd3e8c775b6810eab2e1e3be3/ui/gfx/animation/animation_test_api.h
[modify] https://crrev.com/fe6f35b2483e35bcd3e8c775b6810eab2e1e3be3/ui/gfx/animation/slide_animation_unittest.cc