Extend chromium_tests trigger to work across masters.

scripts/slave/recipes/chromium.expected/full_chromium_gpu_fyi_GPU_Mac_Builder.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
       "chromium.gpu.fyi",
       "--builder",
       "GPU Mac Builder",
@@ skipping 474 matching lines @@
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     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]