Add UMA metric: Startup.BrowserMainToRendererMain.

content/renderer/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("//content/renderer/renderer.gni")
 import("//media/media_options.gni")
 
 source_set("renderer") {
@@ skipping 11 matching lines @@
   ]
 
   deps = [
     # TODO(GYP) bug 376846 remove this. This should be inherited from //net but
     # those don't cross component boundaries.
     "//crypto:platform",
     "//base/allocator",
     "//cc",
     "//cc/blink",
     "//components/scheduler:scheduler",
+    "//components/startup_metric_utils/common",
     "//components/url_formatter",
     "//components/webusb",
     "//content:resources",
     "//content/common:mojo_bindings",
     "//content/public/child:child_sources",
     "//content/public/common:common_sources",
     "//content/public/common:mojo_bindings",
     "//device/battery:mojo_bindings",
     "//device/vibration:mojo_bindings",
     "//gin",
@@ skipping 178 matching lines @@
 
   if (enable_webvr) {
     sources += [
       "vr/vr_dispatcher.cc",
       "vr/vr_dispatcher.h",
       "vr/vr_type_converters.cc",
       "vr/vr_type_converters.h",
     ]
   }
 }