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Resetting the starting layout loses context about views that are fading
in our out, causing popping of layouts in some cases (especially during
slide animations).

Having a layout reset multiple times can happen when one view is hidden
and another view shown within the same host view with an animating
layout. Ensuring that only the final change "sticks" makes for a smooth
transition from the pre-modification state.

Bug: 1037947
Change-Id: Ibc1dbb2f249d1edfd21294202467d2292d0591a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1981333
Commit-Queue: Dana Fried <dfried@chromium.org>
Reviewed-by: Taylor Bergquist <tbergquist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727514}