Implement Password Manager aggregate metrics reporting

chrome/browser/password_manager/login_database.h

 // Copyright (c) 2010 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_LOGIN_DATABASE_H_
 #define CHROME_BROWSER_PASSWORD_MANAGER_LOGIN_DATABASE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 10 matching lines @@
 // the login information.
 class LoginDatabase {
  public:
   LoginDatabase();
   virtual ~LoginDatabase();
 
   // Initialize the database with an sqlite file at the given path.
   // If false is returned, no other method should be called.
   bool Init(const FilePath& db_path);
 
+  // Reports usage metrics to UMA.
+  void ReportMetrics();
+
   // Adds |form| to the list of remembered password forms.
   bool AddLogin(const webkit_glue::PasswordForm& form);
 
   // Updates remembered password form. Returns true on success and sets
   // items_changed (if non-NULL) to the number of logins updated.
   bool UpdateLogin(const webkit_glue::PasswordForm& form, int* items_changed);
 
   // Removes |form| from the list of remembered password forms.
   bool RemoveLogin(const webkit_glue::PasswordForm& form);
 
@@ skipping 46 matching lines @@
       bool blacklisted, std::vector<webkit_glue::PasswordForm*>* forms) const;
 
   mutable sql::Connection db_;
   sql::MetaTable meta_table_;
 
   DISALLOW_COPY_AND_ASSIGN(LoginDatabase);
 };
 
 
 #endif  // CHROME_BROWSER_PASSWORD_MANAGER_LOGIN_DATABASE_H_