Print out OS name and version in telemetry test.

Apparently some GPU bots's OS are not what they claim to be.

BUG=
TEST=gpu bots
R=kbr@chromium.org,dtu@chromium.org

Review URL: https://codereview.chromium.org/164413006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252498 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252498