Add UMA metrics and histograms for locally managed users.

chrome/browser/policy/url_blacklist_manager.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_POLICY_URL_BLACKLIST_MANAGER_H_
 #define CHROME_BROWSER_POLICY_URL_BLACKLIST_MANAGER_H_
 
 #include <map>
 #include <string>
 
@@ skipping 31 matching lines @@
   // http://www.chromium.org/administrators/url-blacklist-filter-format.
   void Block(const base::ListValue* filters);
 
   // URLs matching one of the |filters| will be allowed. If a URL is both
   // Blocked and Allowed, Allow takes precedence.
   void Allow(const base::ListValue* filters);
 
   // Returns true if the URL is blocked.
   bool IsURLBlocked(const GURL& url) const;
 
+  // Returns the number of items in the list.
+  size_t Size() const;
+
   // Returns true if the URL has a standard scheme. Only URLs with standard
   // schemes are filtered.
   static bool HasStandardScheme(const GURL& url);
 
   // Splits a URL filter into its components. A GURL isn't used because these
   // can be invalid URLs e.g. "google.com".
   // Returns false if the URL couldn't be parsed.
   // The |host| is preprocessed so it can be passed to URLMatcher for the
   // appropriate condition.
   // The optional username and password are ignored.
@@ skipping 106 matching lines @@
 
   // The current blacklist.
   scoped_ptr<URLBlacklist> blacklist_;
 
   DISALLOW_COPY_AND_ASSIGN(URLBlacklistManager);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_URL_BLACKLIST_MANAGER_H_