Audit the last usage of Geolocation and Notification permissions.

chrome/browser/content_settings/content_settings_pref_provider.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_CONTENT_SETTINGS_CONTENT_SETTINGS_PREF_PROVIDER_H_
 #define CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_PREF_PROVIDER_H_
 
 // A content settings provider that takes its settings out of the pref service.
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/prefs/pref_change_registrar.h"
 #include "base/synchronization/lock.h"
 #include "chrome/browser/content_settings/content_settings_observable_provider.h"
 #include "chrome/browser/content_settings/content_settings_origin_identifier_value_map.h"
 #include "chrome/browser/content_settings/content_settings_utils.h"
 
 class PrefService;
 
 namespace base {
+class Clock;
 class DictionaryValue;
 }
 
 namespace user_prefs {
 class PrefRegistrySyncable;
 }
 
 namespace content_settings {
 
 // Content settings provider that provides content settings from the user
@@ skipping 16 matching lines @@
       const ContentSettingsPattern& secondary_pattern,
       ContentSettingsType content_type,
       const ResourceIdentifier& resource_identifier,
       base::Value* value) OVERRIDE;
 
   virtual void ClearAllContentSettingsRules(
       ContentSettingsType content_type) OVERRIDE;
 
   virtual void ShutdownOnUIThread() OVERRIDE;
 
+  // Records the last time the given pattern has used a certain content setting.
+  virtual void UpdateLastUsage(const ContentSettingsPattern& primary_pattern,
+                               const ContentSettingsPattern& secondary_pattern,
+                               ContentSettingsType content_type);
+
+  base::Time GetLastUsage(const ContentSettingsPattern& primary_pattern,
+                          const ContentSettingsPattern& secondary_pattern,
+                          ContentSettingsType content_type);
+
+  // Gains ownership of |clock|.
+  void SetClockForTesting(base::Clock* clock);
+
  private:
   friend class DeadlockCheckerThread;  // For testing.
   // Reads all content settings exceptions from the preference and load them
   // into the |value_map_|. The |value_map_| is cleared first if |overwrite| is
   // true.
   void ReadContentSettingsFromPref(bool overwrite);
 
   // Callback for changes in the pref with the same name.
   void OnContentSettingsPatternPairsChanged();
 
@@ skipping 15 matching lines @@
       base::DictionaryValue* all_settings_dictionary);
 
   // In the debug mode, asserts that |lock_| is not held by this thread. It's
   // ok if some other thread holds |lock_|, as long as it will eventually
   // release it.
   void AssertLockNotHeld() const;
 
   // Weak; owned by the Profile and reset in ShutdownOnUIThread.
   PrefService* prefs_;
 
+  // Can be set for testing.
+  scoped_ptr<base::Clock> clock_;
+
   bool is_incognito_;
 
   PrefChangeRegistrar pref_change_registrar_;
 
   // Whether we are currently updating preferences, this is used to ignore
   // notifications from the preferences service that we triggered ourself.
   bool updating_preferences_;
 
   OriginIdentifierValueMap value_map_;
 
   OriginIdentifierValueMap incognito_value_map_;
 
   // Used around accesses to the value map objects to guarantee thread safety.
   mutable base::Lock lock_;
 
   DISALLOW_COPY_AND_ASSIGN(PrefProvider);
 };
 
 }  // namespace content_settings
 
 #endif  // CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_PREF_PROVIDER_H_