WebRTC: Use goma from cipd

scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_win_x64_gn_dbg.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::bot_update]\\resources\\bot_update.py",
       "--master",
       "tryserver.webrtc",
       "--builder",
       "win_x64_gn_dbg",
@@ skipping 92 matching lines @@
       "-u",
       "[DEPOT_TOOLS]\\gn.py",
       "--root=[SLAVE_BUILD]\\src",
       "gen",
       "//out/Debug_x64",
       "--args=ffmpeg_branding=\"Chrome\" rtc_use_h264=true is_debug=true target_cpu=\"x64\" use_goma=true goma_dir=\"[BUILD]\\goma\""
     ],
     "name": "gn"
   },
   {
+    "cmd": [],
+    "name": "ensure_goma"
+  },
+  {
     "cmd": [
       "python",
       "-u",
+      "RECIPE_MODULE[build::cipd]\\resources\\bootstrap.py",
+      "--platform",
+      "windows-amd64",
+      "--dest-directory",
+      "[SLAVE_BUILD]\\cipd",
+      "--json-output",
+      "/path/to/tmp/json"
+    ],
+    "name": "ensure_goma.install cipd",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_TEXT@cipd instance_id: 40-chars-fake-of-the-package-instance_id@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"executable\": \"[SLAVE_BUILD]\\\\cipd\\\\cipd\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"instance_id\": \"40-chars-fake-of-the-package-instance_id\"@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "[SLAVE_BUILD]\\cipd\\cipd",
+      "ensure",
+      "--root",
+      "[CACHE]\\cipd\\goma",
+      "--list",
+      "infra_internal/goma/client/windows-amd64 release",
+      "--json-output",
+      "/path/to/tmp/json",
+      "--service-account-json",
+      "C:\\creds\\service_accounts\\service-account-goma-client.json"
+    ],
+    "name": "ensure_goma.ensure_installed",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"result\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@    {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"instance_id\": \"resolved-instance_id-of-release---------\", @@@",
+      "@@@STEP_LOG_LINE@json.output@      \"package\": \"infra_internal/goma/client/windows-amd64\"@@@",
+      "@@@STEP_LOG_LINE@json.output@    }@@@",
+      "@@@STEP_LOG_LINE@json.output@  ]@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
       "RECIPE_PACKAGE_REPO[build]\\scripts\\tools\\runit.py",
       "--show-path",
       "python",
       "RECIPE_PACKAGE_REPO[build]\\scripts\\slave\\compile.py",
       "--gsutil-py-path",
       "RECIPE_PACKAGE_REPO[depot_tools]\\gsutil.py",
       "--ninja-path",
       "RECIPE_PACKAGE_REPO[depot_tools]\\ninja.exe",
       "--target",
       "Debug_x64",
       "--src-dir",
       "[SLAVE_BUILD]\\src",
       "--goma-cache-dir",
       "[GOMA_CACHE]",
       "--build-tool",
       "ninja",
       "--compiler",
       "goma",
       "--goma-jsonstatus",
       "/path/to/tmp/json",
       "--goma-service-account-json-file",
       "C:\\creds\\service_accounts\\service-account-goma-client.json",
       "--goma-dir",
-      "[BUILD]\\goma",
+      "[CACHE]\\cipd\\goma",
       "--goma-fail-fast",
       "--goma-disable-local-fallback",
       "--",
       "all"
     ],
     "env": {
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "C:\\creds\\service_accounts\\service-account-goma-client.json"
     },
     "name": "compile",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output (invalid)@null@@@",
       "@@@STEP_LOG_END@json.output (invalid)@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]