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- To measure dropped frames/second.
- To calculate extrapolation of the utilization to play the test video.

Note: Moving Netflix helper functions to a separate class, so they can be reused easily for other Netflix tests.
Review URL: http://codereview.chromium.org/8562006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@111063 0039d316-1c4b-4281-b951-d872f2087c98