38214d53db5f19228b38424700db8b90cf8b0234

This patch lets EchoCancellationImpl::ProcessRenderAudio ask the given AudioBuffer for float sample data directly, instead of asking for int16 samples and then converting manually. Since EchoCancellationImpl::ProcessRenderAudio takes a const AudioBuffer*, it was necessary to add some const accessors for float data to AudioBuffer. R=aluebs@webrtc.org, andrew@webrtc.org, bjornv@webrtc.org Review URL: https://webrtc-codereview.appspot.com/14749004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@6590 4adac7df-926f-26a2-2b94-8c16560cd09d
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