Automated Commit: Committing new LKGM version 5121.0.0 for chromeos.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241822 0039d316-1c4b-4281-b951-d872f2087c98
telmetry: compute thread_time_bounds per thread.

BUG=328561

Review URL: https://codereview.chromium.org/117803003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241823 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241823