Audit the last usage of Geolocation and Notification permissions.

chrome/browser/content_settings/content_settings_pref_provider.h

Index: chrome/browser/content_settings/content_settings_pref_provider.h
diff --git a/chrome/browser/content_settings/content_settings_pref_provider.h b/chrome/browser/content_settings/content_settings_pref_provider.h
index 9d8a2bcba85cd040601ca7c616b3483b739f0dbd..08a9d1b9b415f369b84c748894ac4920cd5b8981 100644
--- a/chrome/browser/content_settings/content_settings_pref_provider.h
+++ b/chrome/browser/content_settings/content_settings_pref_provider.h
@@ -19,6 +19,7 @@
 class PrefService;
 
 namespace base {
+class Clock;
 class DictionaryValue;
 }
 
@@ -55,6 +56,18 @@ class PrefProvider : public ObservableProvider {
 
   virtual void ShutdownOnUIThread() OVERRIDE;
 
+  // Records the last time the given pattern has used a certain content setting.
+  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(scoped_ptr<base::Clock> clock);
+
  private:
   friend class DeadlockCheckerThread;  // For testing.
   // Reads all content settings exceptions from the preference and load them
@@ -90,6 +103,9 @@ class PrefProvider : public ObservableProvider {
   // 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_;