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MediaStreamCenter::didCreateMediaStream is called from here.
https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/modules/mediastream/MediaStream.cpp&sq=package:chromium&type=cs&l=146&rcl=1447771613

Before that, the tracks have already been created.

Review URL: https://codereview.chromium.org/1462473002

Cr-Commit-Position: refs/heads/master@{#360554}