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This CL sets up the video player HTML/JS files to be served locally
through chrome-untrusted:// scheme. It currently uses a WebUIDataSource
and will be moved to an untrusted WebUIController factory once it is
ready.

Bug: 1129715
Change-Id: I1d514c5f316a462547ef6e1dff78cfecbf143fdd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414787
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809209}