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On older versions of Android (M-), the hint text isn't announced for
accessibility. The content description, however, is announced. Behavior
is unchanged on newer versions of Android (N+).

BUG=911762

Change-Id: I8c5a2e90c14d08c925875f4b76af03de9a3f1178
Reviewed-on: https://chromium-review.googlesource.com/c/1392172Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Reviewed-by: Becky Zhou <huayinz@chromium.org>
Commit-Queue: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619775}