[Telemetry]: Add Impact HTML5 Gaming benchmark suite.

TEST= tools/perf/run_benchmark --browser=system html5gaming

Review URL: https://codereview.chromium.org/32753005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@231103 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 231103