Inform user that Dictation sends audio to Google.

Dictation is an accessibility feature that allows users who opt-in
to have their speech transcribed into any text field in ChromeOS.


Screenshot: https://screenshot.googleplex.com/EkLrrNDAohB.png

BUG=850690
TEST=None

Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I11ca4051b38a4beec7876ba35899e337f36411e4
Reviewed-on: https://chromium-review.googlesource.com/1120852
Commit-Queue: Zach Helfinstein <zhelfins@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575875}
10 files changed