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This CL implements a title bar animation for hosted apps on chromeOS
that shows the URL's origin for a few seconds when the window opens.
This CL omits the menu button highlight animation as that will be
implemented in a follow up CL.

See bug for screencasts.

Bug: 809794
Change-Id: Ied16c5720722f994fa73cafd15c2f42e3d671e50
Reviewed-on: https://chromium-review.googlesource.com/942722
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542763}