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Test gathers the EPP and TTP metrics for video playback under
constrained network conditions.  The test uses the Constrained Network
Server (CNS) to accomplish this.

 - Starts CNS.
 - Iterates over test matrix of network constraints.
 - Reports results in a manner consumable by chromium.perf_av.
 - Stops CNS.

BUG=106257
TEST=Ran test locally.


Review URL: http://codereview.chromium.org/8802030

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@114071 0039d316-1c4b-4281-b951-d872f2087c98