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Prior to this patch, if the top-view was configured to only expand
at top, then on page load the top-view would not be shown.

During a load if current_browser_controls_visibility_constraint_ is BOTH,
then cc is called with current and constraints of BOTH. cc doesn't do
anything in this case. As we need to ensure the top-view is shown in
this scenario this changes the code to supply SHOWN.

This code path is only hit if top-view is configured to
only-expand-at-top, as when only-expand-at-top is false,
current_browser_controls_visibility_constraint_ is set to SHOWN.

I experimented with fixing in cc, but cc has no notion of page
loading. So, this fix is better done in WebLayer.

BUG=1135964
TEST=BrowserControlsTest

Change-Id: I7834ade5cd80de6946af0c2f917fb0ea1996e1f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2476725
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817985}