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Use requestAnimationFrame() to change the CSS to collapsed the search
box to give the chance for the button to process the collapse at the
click.

Add a test so we don't regress on this again.

Test: browser_tests --gtest_filter="*searchButtonToggles*"
Bug: 1062148
Change-Id: I628fb0b22f0a0223d659743618e7077ff0a7007d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2112171
Auto-Submit: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751997}