Audit the last usage of Geolocation and Notification permissions.

chrome/browser/content_settings/host_content_settings_map.h

Index: chrome/browser/content_settings/host_content_settings_map.h
diff --git a/chrome/browser/content_settings/host_content_settings_map.h b/chrome/browser/content_settings/host_content_settings_map.h
index 8d5681a1536a92a9e18978146b253f66554431db..7e2d9c70faafc59dfb820c0ddc5ee09ae9c297a4 100644
--- a/chrome/browser/content_settings/host_content_settings_map.h
+++ b/chrome/browser/content_settings/host_content_settings_map.h
@@ -27,6 +27,7 @@ class GURL;
 class PrefService;
 
 namespace base {
+class Clock;
 class Value;
 }
 
@@ -199,6 +200,28 @@ class HostContentSettingsMap
     return is_off_the_record_;
   }
 
+  // Updates the pattern that matches the URLs last time of use.
+  //
+  // This should only be called on the UI thread.
+  void UpdateLastUsage(const GURL& primary_url,
+                       const GURL& secondary_url,
+                       ContentSettingsType content_type);
+
+  // Returns the last time the pattern that matches the URL has requested
+  // permission for the |content_type| setting.
+  base::Time GetLastUsage(const GURL& primary_url,
+                          const GURL& secondary_url,
+                          ContentSettingsType content_type);
+
+  // Returns the last time the pattern has requested permission for the
+  // |content_type| setting.
+  base::Time GetLastUsageByPattern(
+      const ContentSettingsPattern& primary_pattern,
+      const ContentSettingsPattern& secondary_pattern,
+      ContentSettingsType content_type);
+
+  void SetPrefClockForTesting(base::Clock* clock);
+
  private:
   friend class base::RefCountedThreadSafe<HostContentSettingsMap>;
   friend class HostContentSettingsMapTest_NonDefaultSettings_Test;
@@ -236,6 +259,12 @@ class HostContentSettingsMap
   // it is not being called too late.
   void UsedContentSettingsProviders() const;
 
+  // Convenience method for updating the last usage of a content type for a
+  // pattern.
+  void UpdateLastUsageByPattern(const ContentSettingsPattern& primary_pattern,
+                                const ContentSettingsPattern& secondary_pattern,
+                                ContentSettingsType content_type);
+
 #ifndef NDEBUG
   // This starts as the thread ID of the thread that constructs this
   // object, and remains until used by a different thread, at which