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The extension inline install dialog contains a section for the webstore
ratings. This is rendered as a star rating (n / 5 filled stars) and a
user count displayed in parentheses. For example,
***** (345)

Unfortunately, the accessible text for this is lacking - each star
(filled or not) simply says "graphic", followed by the number. So the
content read by a screen reader would be:
"graphic graphic graphic graphic graphic 345"
which is very unhelpful.

Introduce a custom view for the ratings section, which hides the star
graphics and the user label from the accessibility tree. Instead,
provide custom accessible text to give meaning. Now, the screen reader
will read:
"Rated 5.0 by 345 users"

Bug: 747624

Change-Id: I96d829efd098cc6795389b3190f0c2a901f55a93
Reviewed-on: https://chromium-review.googlesource.com/782711
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520693}