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This will be used on Clusterfuzz, and we might ship this on the Canary sometimes if the performances are reasonable.

BUG=

Review URL: https://codereview.chromium.org/321303002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@276746 0039d316-1c4b-4281-b951-d872f2087c98