Add WebRtcGetUserMediaBrowserTest OnFrameAvailable Android performance tracing test.

Consolidated performance logic into a single 
RunGetUserMediaAndCollectMeasures(), basically abstracting
what used to be in the "original" 
TracePerformanceDuringGetUserMedia().

And renamed TracePerformanceDuringGetUserMedia to
TraceVideoCaptureControllerPerformanceDuringGetUserMedia.

BUG=329505

Review URL: https://codereview.chromium.org/143323004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245934 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 245934