[Android Compile Server] Check to see if requested job is already running to prevent duplicate tasks
[Android Compile Server] Check to see if requested job is already running to prevent duplicate tasks

Bug: skia:7608
Change-Id: I4b055b09687e7ec4b324092a216a65157a67a7eb
Reviewed-on: https://skia-review.googlesource.com/106680
Reviewed-by: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@google.com>
Commit-Queue: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@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