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This also refactors some of the padding and allocation code in ViEEncoder, and makes ChannelGroup a simple forwarder from BitrateController to BitrateAllocator. This CL is part of a bigger picture, see https://review.webrtc.org/35319004/ for details. BUG=4323 R=mflodman@webrtc.org, pbos@webrtc.org, sprang@webrtc.org Review URL: https://webrtc-codereview.appspot.com/44399004 Cr-Commit-Position: refs/heads/master@{#8595} git-svn-id: http://webrtc.googlecode.com/svn/trunk@8595 4adac7df-926f-26a2-2b94-8c16560cd09d