[Telemetry] Add cold and warm session restore benchmarks

BUG=258105

Review URL: https://codereview.chromium.org/32193008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230522 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230522