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fbarchard@google.com committed ffaea7eee38
ARGBGray function for convertion a rectangle of ARGB to gray scale BUG=none TEST=none Review URL: https://webrtc-codereview.appspot.com/582007 git-svn-id: http://libyuv.googlecode.com/svn/trunk@269 16f28f9a-4ce2-e073-06de-1de4eb20be90