[Picture-in-Picture] Add test for consuming user gesture.

This merge all request Picture-in-Picture tests into one test file and
adds one test to make sure user gesture is consumed by request
Picture-in-Picture so that a site couldn't produce a popup and a video
played in Picture-in-Picture on the same gesture.

Bug: 806249
Change-Id: Id974342b5cb48c1b60a44074d41603e93d2192e7
Reviewed-on: https://chromium-review.googlesource.com/909148
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: apacible <apacible@chromium.org>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#535694}
2 files changed