Add counting the number of CPU's in goma module

scripts/slave/recipes/mojo.expected/mojo_linux.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
       "--master",
       "chromium.testing.master",
       "--builder",
       "Mojo Linux",
@@ skipping 103 matching lines @@
       "@@@STEP_LOG_LINE@json.output@    }@@@",
       "@@@STEP_LOG_LINE@json.output@  ]@@@",
       "@@@STEP_LOG_LINE@json.output@}@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
+      "\nimport multiprocessing\nprint min(200, multiprocessing.cpu_count() * 10)\n"
+    ],
+    "name": "ensure_goma.get the number of cpus",
+    "stdout": "/path/to/tmp/",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@python.inline@@@@",
+      "@@@STEP_LOG_LINE@python.inline@import multiprocessing@@@",
+      "@@@STEP_LOG_LINE@python.inline@print min(200, multiprocessing.cpu_count() * 10)@@@",
+      "@@@STEP_LOG_END@python.inline@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
       "[SLAVE_BUILD]/src/mojo/tools/mojob.py",
       "gn",
       "--release"
     ],
     "cwd": "[SLAVE_BUILD]/src",
     "env": {
       "GOMA_DIR": "[CACHE]/cipd/goma",
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
     },
     "name": "mojob gn"
@@ skipping 47 matching lines @@
       "[SLAVE_BUILD]/src/mojo/tools/upload_binaries.py"
     ],
     "name": "upload shell and app binaries"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]