Add a sketch of a test_perf script

Add a sketch of a test_perf script

This script isn't quite working, but it's valuable to checkpoint the work at
this point. I'm coordinating with the chromeperf.appspot.com folks to get the
server to accept the data.

R=eseidel@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/3cfbe90e6bda2b161865818598c10fab26364a82

[eseidel, 2014-11-05 00:40:44]

lgtm

https://codereview.chromium.org/702603005/diff/1/sky/tools/test_perf
File sky/tools/test_perf (right):

https://codereview.chromium.org/702603005/diff/1/sky/tools/test_perf#newcode45
sky/tools/test_perf:45: match = re.search(r'values (.+) ms', output,
flags=re.MULTILINE)
maybe a constant with some explanation of what you're attempting to parse here?

https://codereview.chromium.org/702603005/diff/1/sky/tools/test_perf#newcode50
sky/tools/test_perf:50: revision = subprocess.check_output(["git", "show-ref",
"HEAD", "-s"]).strip()
James just wrote this same code.  We're gonna evnetually want a skypy.git or
similar.

[abarth-chromium, 2014-11-05 00:45:47]

Committed patchset #1 (id:1) manually as
3cfbe90e6bda2b161865818598c10fab26364a82 (presubmit successful).