[Android] Close accessory when suggestions were filled

This is a reland of https://chromium-review.googlesource.com/1126244
which was reverted because it promoted a legacy bug which triggered
a 2D keyboard in VR mode.

The keyboard accessory is not enabled in VR mode.
There is a test to ensure that resetting that the sheet doesn't
trigger the keyboard unnecessarily anymore.

Original change's description:
> This CL causes the accessory sheet to close when a user selected a valid
> filling suggestions.
> There is no indicator of the negative case yet (i.e. error during
> filling).

TBR=rouslan@chromium.org

Bug: 856026, 857592, 865749
Change-Id: I71abca9366cfa96789ffe7538204f5435332e4ac
Reviewed-on: https://chromium-review.googlesource.com/1146361
Commit-Queue: Friedrich Horschig <fhorschig@chromium.org>
Reviewed-by: Aldo Culquicondor <acondor@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Friedrich Horschig <fhorschig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578343}
16 files changed