Deterministic build: Support Goma.

scripts/slave/recipes/swarming/deterministic_build.expected/full_chromium_swarm_Linux_deterministic_build.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/bot_update.py",
       "--master",
       "chromium.swarm",
       "--builder",
       "Linux deterministic build",
@@ skipping 61 matching lines @@
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "[DEPOT_TOOLS]/gclient.py",
       "runhooks"
     ],
     "env": {
-      "GYP_DEFINES": "component=static_library dont_embed_build_metadata=1 target_arch=ia32"
+      "GYP_DEFINES": "component=static_library dont_embed_build_metadata=1 gomadir='[BUILD]/goma' target_arch=ia32 use_goma=1"
     },
     "name": "gclient runhooks"
   },
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/compile.py",
       "--target",
       "Release",
       "--src-dir",
       "[SLAVE_BUILD]/src",
       "--build-tool",
       "ninja",
+      "--compiler",
+      "goma",
+      "--goma-dir",
+      "[BUILD]/goma",
       "--clobber",
       "--",
       "chrome_run"
     ],
     "name": "First build"
   },
   {
     "cmd": [
       "python",
       "-u",
@@ skipping 30 matching lines @@
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/compile.py",
       "--target",
       "Release",
       "--src-dir",
       "[SLAVE_BUILD]/src",
       "--build-tool",
       "ninja",
+      "--compiler",
+      "goma",
+      "--goma-dir",
+      "[BUILD]/goma",
       "--clobber",
       "--",
       "chrome_run"
     ],
     "name": "Second build"
   },
   {
     "cmd": [
       "python",
       "-u",
@@ skipping 20 matching lines @@
       "[BUILD]/scripts/slave/recipe_modules/isolate/resources/compare_build_artifacts.py",
       "--first-build-dir",
       "[SLAVE_BUILD]/src/out/Release.1",
       "--second-build-dir",
       "[SLAVE_BUILD]/src/out/Release.2"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "compare_build_artifacts.py"
   }
 ]