GitLab

This CL adds accessible names to the buttons on the sharesheet
for screen readers.

Bug: 1131296
Change-Id: I4182b3ed982e9f4da7800502ab530e458f91dc58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2423646Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Melissa Zhang <melzhang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810014}