GitLab

I add the followings to histograms.xml.
  SharedWorker.RendererSurviveForWorkerTime
  SharedWorker.TimeToDeleted
  SharedWorker.TimeToScriptLoaded
  SharedWorker.TimeToScriptLoadFailed

They were introduced in http://crrev.com/259790 and http://crrev.com/260376.

BUG=327256

Review URL: https://codereview.chromium.org/245963004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266389 0039d316-1c4b-4281-b951-d872f2087c98