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This cl contains the generation of the RTCP packets containing the log
messages, no code (more than this unittest) trigger the send.
Additionally the receiver is not wired up either. If a receiver receives
a log message today it would be ignored.

Review URL: https://codereview.chromium.org/74613004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@238533 0039d316-1c4b-4281-b951-d872f2087c98