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The impl tree viewport changes caused by |top_controls_shown_ratio_|
changes are not reflected on the main thread when the top controls are
partially shown. This causes a mismatch each time we push property trees
from main > impl.

This change provides a temporary fix by updating the viewport any time
we push main > impl when in a partially shown state.

Long term we should propagate these changes to the main tree and
avoid this workaround.

Bug: 875943
Change-Id: I47e6a5127e6a2c76b5286e257904d2501e3859a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1795572
Commit-Queue: Eric Karl <ericrk@chromium.org>
Commit-Queue: Khushal <khushalsagar@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Auto-Submit: Eric Karl <ericrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695372}