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For some web pages, we'd like to use DefaultRendererFactory, so that we
can render video on graphics plane. This is mainly used to support
playing short video on top of another Cast web page.

Bug: internal b/125912333
Test: Playing video on top of YT doesn't break any pages.
Merge-With: eureka-internal/247900
Change-Id: Ibbcd3ee13e6642aa4d9ab1548a8f64ce95329fdf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1496008
Commit-Queue: Yuchen Liu <yucliu@chromium.org>
Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Reviewed-by: Emily Stark <estark@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Sean Topping <seantopping@chromium.org>
Cr-Commit-Position: refs/heads/master@{#637824}