[Picture-in-Picture] Disable if no GPU compositing.

This is a temporary fix that sets document.pictureInPictureEnabled to
false in the case of disabling the GPU.

Bug: 806249, 807840
Change-Id: I84445a0231b46cfbd0bb2f25eaca53f96604ce55
Reviewed-on: https://chromium-review.googlesource.com/1042290
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556438}
1 file changed