Print out detailed bot revision information.

I find that when I'm waiting for a NeedsRebaseline to go through that I want to
know which bot I'm waiting on so I can go check if it's wedged. So, print out per-bot data.

Review URL: https://chromiumcodereview.appspot.com/22748003

git-svn-id: svn://svn.chromium.org/blink/trunk@155981 bbb929c8-8fbe-4397-9dbb-9b2b20218538