Add several new TRACE call and UMA metrics for GetProfile()

components/keyed_service/content/browser_context_dependency_manager.cc

 // 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.
 
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 
 #include "base/memory/singleton.h"
 #include "base/trace_event/trace_event.h"
 #include "content/public/browser/browser_context.h"
 
 #ifndef NDEBUG
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 
 // Dumps dependency information about our browser context keyed services
 // into a dot file in the browser context directory.
 const char kDumpBrowserContextDependencyGraphFlag[] =
     "dump-browser-context-graph";
 #endif  // NDEBUG
 
 void BrowserContextDependencyManager::RegisterProfilePrefsForServices(
     const content::BrowserContext* context,
     user_prefs::PrefRegistrySyncable* pref_registry) {
+  TRACE_EVENT0(
+     "browser",
+     "BrowserContextDependencyManager::RegisterProfilePrefsForServices");
   RegisterPrefsForServices(context, pref_registry);
 }
 
 void BrowserContextDependencyManager::CreateBrowserContextServices(
     content::BrowserContext* context) {
   DoCreateBrowserContextServices(context, false);
 }
 
 void BrowserContextDependencyManager::CreateBrowserContextServicesForTest(
     content::BrowserContext* context) {
@@ skipping 52 matching lines @@
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           kDumpBrowserContextDependencyGraphFlag)) {
     base::FilePath dot_file =
         static_cast<const content::BrowserContext*>(context)
             ->GetPath()
             .AppendASCII("browser-context-dependencies.dot");
     DumpDependenciesAsGraphviz("BrowserContext", dot_file);
   }
 }
 #endif  // NDEBUG