[Password Manager] Add UMA stats to track interaction with synced accounts.

chrome/browser/password_manager/password_store_mac.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.
 
 #ifndef CHROME_BROWSER_PASSWORD_MANAGER_PASSWORD_STORE_MAC_H_
 #define CHROME_BROWSER_PASSWORD_MANAGER_PASSWORD_STORE_MAC_H_
 
 #include <vector>
 
 #include "base/callback_forward.h"
@@ skipping 20 matching lines @@
   // Takes ownership of |keychain| and |login_db|, both of which must be
   // non-NULL.
   PasswordStoreMac(
       scoped_refptr<base::SingleThreadTaskRunner> main_thread_runner,
       scoped_refptr<base::SingleThreadTaskRunner> db_thread_runner,
       crypto::AppleKeychain* keychain,
       password_manager::LoginDatabase* login_db);
 
   // Initializes |thread_|.
   virtual bool Init(
-      const syncer::SyncableService::StartSyncFlare& flare) OVERRIDE;
+      const syncer::SyncableService::StartSyncFlare& flare,
+      const std::string& sync_username) OVERRIDE;
 
   // Stops |thread_|.
   virtual void Shutdown() OVERRIDE;
 
  protected:
   virtual ~PasswordStoreMac();
 
   virtual scoped_refptr<base::SingleThreadTaskRunner>
       GetBackgroundTaskRunner() OVERRIDE;
 
  private:
-  virtual void ReportMetricsImpl() OVERRIDE;
+  virtual void ReportMetricsImpl(const std::string& sync_username) OVERRIDE;
   virtual password_manager::PasswordStoreChangeList AddLoginImpl(
       const autofill::PasswordForm& form) OVERRIDE;
   virtual password_manager::PasswordStoreChangeList UpdateLoginImpl(
       const autofill::PasswordForm& form) OVERRIDE;
   virtual password_manager::PasswordStoreChangeList RemoveLoginImpl(
       const autofill::PasswordForm& form) OVERRIDE;
   virtual password_manager::PasswordStoreChangeList
       RemoveLoginsCreatedBetweenImpl(base::Time delete_begin,
                                      base::Time delete_end) OVERRIDE;
   virtual password_manager::PasswordStoreChangeList
@@ skipping 31 matching lines @@
   scoped_ptr<crypto::AppleKeychain> keychain_;
   scoped_ptr<password_manager::LoginDatabase> login_metadata_db_;
 
   // Thread that the synchronous methods are run on.
   scoped_ptr<base::Thread> thread_;
 
   DISALLOW_COPY_AND_ASSIGN(PasswordStoreMac);
 };
 
 #endif  // CHROME_BROWSER_PASSWORD_MANAGER_PASSWORD_STORE_MAC_H_