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This CL makes sure ActivateContents() is implemented for Chrome App
windows so that Back to Tab button in the Picture-in-Picture window
focuses back the window.

Bug: 938250
Change-Id: I4814c52553b8b938bff4005f032a3f83f2e54ce8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1503255Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Cr-Commit-Position: refs/heads/master@{#638030}