Try server and buildbot scripts now using Chromium scripts.
- compatible with depot_tools try commands.
- old build master is converted to use Chromium scripts, according to
http://www.chromium.org/developers/testing/chromium-build-infrastructure/getting-the-buildbot-source/forking-your-buildbot
- slaves can now be run out of a plain checkout, no local configuration needed.

Also added files to make it possible to use tools as a separate checkout.

BUG=None
TEST=Runs on local machine with remote slaves. I've successfully submitted try jobs with both git try and gcl try commands.

Review URL: https://webrtc-codereview.appspot.com/449011

git-svn-id: http://webrtc.googlecode.com/svn/trunk@1945 4adac7df-926f-26a2-2b94-8c16560cd09d
34 files changed