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This CL adds rotation animation to the arrow icon of UnifiedSystemTray's
collapse icon.

TEST=manual
BUG=850441

Change-Id: Ib385803754daa0d19dc2b976ec075d55f775f1cc
Reviewed-on: https://chromium-review.googlesource.com/1098748Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567943}