379069f676
RenderFrame should not modify the I420VideoFrame (and we don't). This CL changes the declaration of RenderFrame from: int32_t RenderFrame(const uint32_t streamId, I420VideoFrame& videoFrame) to: int32_t RenderFrame(const uint32_t streamId, const I420VideoFrame& videoFrame) BUG=1128 R=mflodman@webrtc.org, perkj@webrtc.org Review URL: https://webrtc-codereview.appspot.com/46689005 Cr-Commit-Position: refs/heads/master@{#8902}