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VideoFrameFactory has a single frame buffer that is used when scaling frames. If the previous frame is still in use, we need to allocate a new frame. BUG=4347 R=perkj@webrtc.org Review URL: https://webrtc-codereview.appspot.com/36359004 Cr-Commit-Position: refs/heads/master@{#8549} git-svn-id: http://webrtc.googlecode.com/svn/trunk@8549 4adac7df-926f-26a2-2b94-8c16560cd09d