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This CL make sure the Picture-in-Picture window playback state is
reflected when video src changes. It is a follow-up to
https://chromium-review.googlesource.com/1089331

Bug: 726619
Change-Id: Ic756c03aa023d3e4e229c7495686ea8f322503e3
Reviewed-on: https://chromium-review.googlesource.com/1133168
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Matthew Wolenetz <wolenetz@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576428}