debugger: Move to a different port than Prometheus.
debugger: Move to a different port than Prometheus.

BUG=skia:

Change-Id: I3ca4825e6699bc292dde7c395c42f2ddef63a234
Reviewed-on: https://skia-review.googlesource.com/7873
Reviewed-by: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@google.com>
Commit-Queue: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot