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We record seek performance using the product of:
- Video formats: webm and ogv.
- Network constraints: cable, wifi, and no constraints.
- Seek cases: long, short, and buffered seeks.
- Video location: cached and un-cached videos.

BUG=122749
TEST=manual run


Review URL: http://codereview.chromium.org/9960063

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@133585 0039d316-1c4b-4281-b951-d872f2087c98