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This patch adds a histogram to measure what the delay would have been,
had we waited for information from DNS in order to make a certificate
verification decision.

BUG=none
TEST=none

http://codereview.chromium.org/6329001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@71445 0039d316-1c4b-4281-b951-d872f2087c98