Add counting the number of CPU's in goma module

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

Index: scripts/slave/recipes/chromium.expected/buildnumber_zero.json
diff --git a/scripts/slave/recipes/chromium.expected/buildnumber_zero.json b/scripts/slave/recipes/chromium.expected/buildnumber_zero.json
index 988f86a907d56f76d521d48efc84851820f5c535..7f1c5262b3e03f2daad801dc807bebfa580cd938 100644
--- a/scripts/slave/recipes/chromium.expected/buildnumber_zero.json
+++ b/scripts/slave/recipes/chromium.expected/buildnumber_zero.json
@@ -167,6 +167,22 @@
     "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/tools/swarming_client/swarming.py",
       "--version"
     ],