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The new interface is called createWebAudioSourceFromMediaStreamTrack(), it is used to create one WebAudioSource for each CreateMediaStreamSource() call. By doing this, we avoid calling into the same source provider when there are multiple WebAudio audioContexts.

Note that the code in this is not hooked up to anything. We need to implement the interface in Chrome then hook the code up in AudioContext.cpp

NOTRY=true

BUG=354468

Review URL: https://codereview.chromium.org/204293007

git-svn-id: svn://svn.chromium.org/blink/trunk@169859 bbb929c8-8fbe-4397-9dbb-9b2b20218538