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This CL adds an "animate" flag to Browser.setTopView that allows the
embedder to tell WebLayer to animate the top view off the screen when
setting it to null, or to animate it down from the top when setting it
to a non-null value.

The animation off the screen is achieved by removing the View from the
view tree, but keeping the bitmap layer in place, hiding the top
controls, and then deleting the layer after the animation is complete.

Bug: 1108956
Change-Id: Idb9bce6c2633ef6d1d369ccb2741ae6fd1fe43a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2335800Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: David Bokan <bokan@chromium.org>
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797826}