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This CL enables Picture-in-Picture in chrome apps by implementing
EnterPictureInPicture and ExitPictureInPicture in AppDelegate.

Bug: 863309
Change-Id: Ib35e83b03373abe864b3a0674ab1e0b341ce291b
Reviewed-on: https://chromium-review.googlesource.com/1156513
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580497}