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With the new +widgetVibrancyEffectForStyle: visual effect views,
setting the alpha of the button in HighlightButton doesn't work.
(According to the docs, this never should have worked.) Now,
HighlightButton takes a list of views to highlight.

Bug: 976683
Change-Id: I44e6b10e58fad7acb25bb591f46ae31878ab0fdd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1736673
Commit-Queue: Robbie Gibson <rkgibson@google.com>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688052}