clip by adjusting pointer BUG=302 TEST=ARGBScaleDownClipBy2_None R=tpsiaki@google.com
clip by adjusting pointer
BUG=302
TEST=ARGBScaleDownClipBy2_None
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/6529004

git-svn-id: a51711482b6ba0e1d1ab095578a045eeae45ac9a@945 16f28f9a-4ce2-e073-06de-1de4eb20be90

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