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Messages which track the progress of discovery are VLOG(2) and unusual events are VLOG(1).

We can use this to diagnose failures in test automation with release builds.

BUG=394082

Review URL: https://codereview.chromium.org/394383002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@283924 0039d316-1c4b-4281-b951-d872f2087c98