Reland: [Telemetry]: Add V8.MemoryHeapSampleMaximumCommitted to memory metric.

Originally committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=241558
Reverted: https://src.chromium.org/viewvc/chrome?revision=241558&view=revision


BUG=None

Review URL: https://codereview.chromium.org/99863006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242728 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242728