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When this flag is enabled, we'll use a non-compositing decoder in
MediaDrm by default. Otherwise, a compositing decoder will be used
by default.

TBR=ddorwin@chromium.org, qinmin@chromium.org
BUG=163552
TEST=Tried on Nexus 7 with and without this flag.

Review URL: https://codereview.chromium.org/23903023

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@222181 0039d316-1c4b-4281-b951-d872f2087c98