Add android test runner to buildbot_run.

Add a build step that can check out and build an Android tree suitable
for running the 'android' format gyp tests, and run this when the builder
is gyp-android.

BUG=165463
Review URL: https://codereview.chromium.org/11919005

git-svn-id: http://gyp.googlecode.com/svn/trunk@1561 78cadc50-ecff-11dd-a971-7dbc132099af
Update GYP PRESUBMIT.py to adhere to the new copyright boilerplace policy.

BUG=chromium:140977
Review URL: https://codereview.chromium.org/11967026

git-svn-id: http://gyp.googlecode.com/svn/trunk@1562 78cadc50-ecff-11dd-a971-7dbc132099af