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The GetTargetBitrate implementation will return the target bitrate of the codec. This may differ from the desired target bitrate, as set by SetTargetBitrate, depending on implementation. Tests are updated to exercise the new functionality. R=kwiberg@webrtc.org Review URL: https://codereview.webrtc.org/1184313002. Cr-Commit-Position: refs/heads/master@{#9461}