bin/try: add support for internal bots

Bug: skia:
Change-Id: Iae6b2dc1098c9763ceec0289129818e1948a974c
Reviewed-on: https://skia-review.googlesource.com/60543
Reviewed-by: Ravi Mistry <rmistry@google.com>
Commit-Queue: Eric Boren <borenet@google.com>
1 file changed