Android: Add form submit user gesture metric.

Track whether form submits have user gestures when opening external
applications.

BUG=839751

Change-Id: I2b3689bc3eded951641ecab80ed2e3f363ff2abb
Reviewed-on: https://chromium-review.googlesource.com/1153771
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Troy Hildebrandt <thildebr@chromium.org>
Commit-Queue: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579105}
2 files changed