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From this patch, libjingle is able to get the signal level and stats from the local audio track in chrome.

Note, that this patch works with and without kEnableAudioTrackProcessing. When kEnableAudioTrackProcessing is set, libjingle gets values from the chromium track, otherwise it will continue to use the values got from webrtc.

After https://codereview.chromium.org/178223013/ is landed, this CL will rebase and implement the GetSignalLevel() correctly.

BUG=334273
TEST=content_unittests, nothing breaks;

Review URL: https://codereview.chromium.org/185413009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255351 0039d316-1c4b-4281-b951-d872f2087c98