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This fixes the following three tests for UAv2:
- BrowserActionApiTest.TestPictureInPictureOnBrowserActionIconClick
- PictureInPictureLazyBackgroundPageApiTest.PictureInPictureInBackgroundPage
- NotificationsApiTest.TestUserGesture

Bug: 860718
Change-Id: I004f7a3922b7b9f39f4371c0dfdd439c6f0b9a07
Reviewed-on: https://chromium-review.googlesource.com/c/1336029Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Mustaq Ahmed <mustaq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608767}