Added a metric to measure how much time is saved by having
spawned an extra attempt - when attempt 1 completes but a retry
attempt was used, log how much longer attempt 1 took.

BUG=85115
TEST=host resolver unit tests
R=eroman
Review URL: http://codereview.chromium.org/7104129

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@89082 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed