GitLab

UnifiedSliderBubbleController was not handling events properly when
the previous bubble was closing e.g. volume key was pressed during
brightness slider is fading out.

TEST=manual
BUG=866301

Change-Id: I93087c01b38cbd7d5f64f8c99c9e0c539113f8d8
Reviewed-on: https://chromium-review.googlesource.com/1159924Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580088}