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This CL creates a custom View (PickerVideoPlayer) to encapsulate the
code in PickerCategoryView that relates to playing videos. The xml
components have already been factored out to a separate xml, and this
moves the corresponding Java code to a separate class also.

Bug: 895776, 656015
Change-Id: I4435f3a02bf18bc7c1afb35f35f34cb156908544
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2016649
Commit-Queue: Finnur Thorarinsson <finnur@chromium.org>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735819}