V8: Switch linux64 bots to mb

scripts/slave/recipes/v8.expected/full_client_v8_V8_Linux64___debug_builder.json

Index: scripts/slave/recipes/v8.expected/full_client_v8_V8_Linux64___debug_builder.json
diff --git a/scripts/slave/recipes/v8.expected/full_client_v8_V8_Linux64___debug_builder.json b/scripts/slave/recipes/v8.expected/full_client_v8_V8_Linux64___debug_builder.json
index 6fd85ad14f9f84c6bfd24dc2adf7cbb4bfc518fa..a6c32dfd4ebcd9aeb3a32b6468e8db30afcc65d1 100644
--- a/scripts/slave/recipes/v8.expected/full_client_v8_V8_Linux64___debug_builder.json
+++ b/scripts/slave/recipes/v8.expected/full_client_v8_V8_Linux64___debug_builder.json
@@ -141,6 +141,7 @@
     "cwd": "[SLAVE_BUILD]/v8",
     "env": {
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json",
+      "GYP_CHROMIUM_NO_ACTION": "1",
       "GYP_DEFINES": "gomadir='[CACHE]/cipd/goma' has_valgrind=1 jsfunfuzz=1 target_arch=x64 test_isolation_mode=prepare use_goma=1 v8_enable_slow_dchecks=1 v8_optimized_debug=1 v8_target_arch=x64",
       "GYP_GENERATORS": "ninja",
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
@@ -162,6 +163,28 @@
     "cmd": [
       "python",
       "-u",
+      "[SLAVE_BUILD]/v8/tools/mb/mb.py",
+      "gen",
+      "-m",
+      "client.v8",
+      "-b",
+      "V8 Linux64 - debug builder",
+      "--config-file",
+      "[SLAVE_BUILD]/v8/infra/mb/mb_config.pyl",
+      "--goma-dir",
+      "[CACHE]/cipd/goma",
+      "--gyp-script=gypfiles/gyp_v8",
+      "//out/Debug"
+    ],
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "/creds/service_accounts/service-account-goma-client.json"
+    },
+    "name": "generate_build_files"
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
       "RECIPE_MODULE[build::v8]/resources/patch_mb_config.py",
       "[SLAVE_BUILD]/v8/infra/mb/mb_config.pyl",
       "/path/to/tmp/"