perf.fyi: Add 'mb' to the Win Clang Builder

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

Index: scripts/slave/recipes/chromium.expected/full_chromium_perf_fyi_Win_Clang_Builder.json
diff --git a/scripts/slave/recipes/chromium.expected/full_chromium_perf_fyi_Win_Clang_Builder.json b/scripts/slave/recipes/chromium.expected/full_chromium_perf_fyi_Win_Clang_Builder.json
index 49aa5377097af3fbdfd95046cf4b5b11d72ec852..a022370bac195c85293ac537037b9fdde0af493f 100644
--- a/scripts/slave/recipes/chromium.expected/full_chromium_perf_fyi_Win_Clang_Builder.json
+++ b/scripts/slave/recipes/chromium.expected/full_chromium_perf_fyi_Win_Clang_Builder.json
@@ -215,6 +215,7 @@
     "cwd": "[BUILDER_CACHE]\\Win_Clang_Builder\\src",
     "env": {
       "GOMA_SERVICE_ACCOUNT_JSON_FILE": "C:\\creds\\service_accounts\\service-account-goma-client.json",
+      "GYP_CHROMIUM_NO_ACTION": "1",
       "GYP_DEFINES": "branding=Chrome buildtype=Official clang=1 component=static_library fastbuild=1 gomadir='[CACHE]\\cipd\\goma' target_arch=ia32 use_goma=1",
       "PATH": "%(PATH)s;RECIPE_PACKAGE_REPO[depot_tools]"
     },
@@ -268,6 +269,28 @@
     "name": "cleanup_temp"
   },
   {
+    "cmd": [
+      "python",
+      "-u",
+      "[BUILDER_CACHE]\\Win_Clang_Builder\\src\\tools\\mb\\mb.py",
+      "gen",
+      "-m",
+      "chromium.perf.fyi",
+      "-b",
+      "Win Clang Builder",
+      "--config-file",
+      "[BUILDER_CACHE]\\Win_Clang_Builder\\src\\tools\\mb\\mb_config.pyl",
+      "--goma-dir",
+      "[CACHE]\\cipd\\goma",
+      "//out/Release"
+    ],
+    "cwd": "[BUILDER_CACHE]\\Win_Clang_Builder\\src",
+    "env": {
+      "GOMA_SERVICE_ACCOUNT_JSON_FILE": "C:\\creds\\service_accounts\\service-account-goma-client.json"
+    },
+    "name": "generate_build_files"
+  },
+  {
     "allow_subannotations": true,
     "cmd": [
       "python",