Introduce Identity Service and its initial usage

chrome/browser/profiles/profile_impl.h

 // Copyright (c) 2012 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.
 
 // This class gathers state related to a single user profile.
 
 #ifndef CHROME_BROWSER_PROFILES_PROFILE_IMPL_H_
 #define CHROME_BROWSER_PROFILES_PROFILE_IMPL_H_
 
 #include <memory>
@@ skipping 178 matching lines @@
 
   void GetCacheParameters(bool is_media_context,
                           base::FilePath* cache_path,
                           int* max_size);
 
   PrefProxyConfigTracker* CreateProxyConfigTracker();
 
   std::unique_ptr<domain_reliability::DomainReliabilityMonitor>
   CreateDomainReliabilityMonitor(PrefService* local_state);
 
+  // Creates an instance of the Identity Service for this Profile, populating it
+  // with the appropriate instances of its dependencies.
+  std::unique_ptr<service_manager::Service> CreateIdentityService();
+
   PrefChangeRegistrar pref_change_registrar_;
 
   base::FilePath path_;
   base::FilePath base_cache_path_;
 
   // !!! BIG HONKING WARNING !!!
   //  The order of the members below is important. Do not change it unless
   //  you know what you're doing. Also, if adding a new member here make sure
   //  that the declaration occurs AFTER things it depends on as destruction
   //  happens in reverse order of declaration.
@@ skipping 64 matching lines @@
   // components/keyed_service/content/browser_context_keyed_service_factory.*
 
   Profile::Delegate* delegate_;
 
   chrome_browser_net::Predictor* predictor_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileImpl);
 };
 
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_IMPL_H_