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Using RGBA implies a colour space conversion in the driver from YUY2 (native capture) to RGBA, which is undone in VideoCaptureController, RGBA to YUV I420. Avoiding this double conversion uses about 5% less CPU in the CMIO thread.

BUG=285967

Review URL: https://chromiumcodereview.appspot.com/23693004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@222250 0039d316-1c4b-4281-b951-d872f2087c98