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This CL is a prepraration step to Onion souping webmediaplayer_ms.cc|h,
webmediaplayer_ms_compositor.cc|h.

It is part of phase 4.4, described in the design doc [1].

[1] https://docs.google.com/document/d/1rHJGi1U72qZsOGIctIf7GKRaY8d7BgtVW8MaMYumzYY/

BUG=704136
R=haraken@chromium.org, hiroshige@chromium.org

Change-Id: Ifa20c5e06feae9433a6c8438f845546088b025f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1692389
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Auto-Submit: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676305}