Magnus Jedvert 26679d6d90 ViEFrameCallback::DeliverFrame: Make I420VideoFrame const ref.
This CL makes ViEFrameCallback::DeliverFrame const and removes the potential frame copy in ViEFrameProviderBase by moving it to ViEEncoder::DeliverFrame instead, for clients that use the FrameCallback functionality to modify the frame content.

BUG=1128
R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/43949004

Cr-Commit-Position: refs/heads/master@{#8934}
2015-04-07 12:07:46 +00:00
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