Make run-perf-tests a wrapper around Telemetry.

Example usages

Run all tests:
$ run-perf-tests

Run all tests on android
$ run-perf-tests --android

Run one test:
$ run-perf-tests Parser/html-parser.html

Profile with perf:
$ run-perf-tests --profiler=perf Parser/html-parser.html

Pass additional command line args:
$ run-perf-tests --additional-flag=--force-compositing-mode Parser/html-parser.html

BUG=
R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/18259011

git-svn-id: svn://svn.chromium.org/blink/trunk@154330 bbb929c8-8fbe-4397-9dbb-9b2b20218538