Add UMA metric: Startup.BrowserMainToRendererMain.

components/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//tools/grit/repack.gni")
 
 # Collection of all components. You wouldn't link to this, but this is rather
@@ skipping 108 matching lines @@
       "//components/proxy_config",
       "//components/query_parser",
       "//components/rappor",
       "//components/renderer_context_menu",
       "//components/resources:components_resources",
       "//components/safe_browsing_db",
       "//components/search_provider_logos",
       "//components/security_interstitials/core",
       "//components/signin/core/browser",
       "//components/ssl_config",
-      "//components/startup_metric_utils/browser",
+      "//components/startup_metric_utils/common",
+      "//components/startup_metric_utils/browser:message_filter",
+      "//components/startup_metric_utils/browser:utils",
       "//components/sync_driver",
       "//components/sync_sessions",
       "//components/tracing",
       "//components/tracing:startup_tracing",
       "//components/translate/content/browser",
       "//components/translate/content/common",
       "//components/translate/content/renderer",
       "//components/translate/core/browser",
       "//components/translate/core/common",
       "//components/ui/zoom",
@@ skipping 487 matching lines @@
   ]
   if (!is_ios) {
     deps += [
       "//base",
       "//base/test:test_support_perf",
       "//content/test:test_support",
       "//components/visitedlink/browser",
     ]
   }
 }