GitLab

Second step towards deprecating "perf_tests_helper.py"
towards more meaningful modules.
Also move thermal_throttle.py into perf/ and some
other minor cleanup.

BUG=

Review URL: https://chromiumcodereview.appspot.com/23681011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@223606 0039d316-1c4b-4281-b951-d872f2087c98