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The animation logic in the BrowserControlsOffsetManager did not
previously account for bottom controls when triggering an early exit.
This change only skips animation if both top and bottom browser
controls are 0.

BUG=713911

Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I9b4a24abfcb3cdd9184370d7bc401dbdec37daa9
Reviewed-on: https://chromium-review.googlesource.com/557953Reviewed-by: Alexandre Elias <aelias@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487497}