Flesh out the content settings exceptions lists a bit more.

chrome/browser/host_content_settings_map.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.
 
 // Maps hostnames to custom content settings.  Written on the UI thread and read
 // on any thread.  One instance per profile.
 
 #ifndef CHROME_BROWSER_HOST_CONTENT_SETTINGS_MAP_H_
 #define CHROME_BROWSER_HOST_CONTENT_SETTINGS_MAP_H_
 #pragma once
@@ skipping 55 matching lines @@
     std::string pattern_;
   };
 
   // Details for the CONTENT_SETTINGS_CHANGED notification. This is sent when
   // content settings change for at least one host. If settings change for more
   // than one pattern in one user interaction, this will usually send a single
   // notification with update_all() returning true instead of one notification
   // for each pattern.
   class ContentSettingsDetails {
    public:
-    explicit ContentSettingsDetails(const Pattern& pattern)
-        : pattern_(pattern), update_all_(false) {}
+    // Update the setting that matches this pattern/content type.
+    ContentSettingsDetails(const Pattern& pattern, ContentSettingsType type)
+        : pattern_(pattern), type_(type) {}
 
-    explicit ContentSettingsDetails(bool update_all)
-        : pattern_(), update_all_(update_all) {}
+    // No pattern is specified. Update all settings for this content type.
+    explicit ContentSettingsDetails(ContentSettingsType type) : type_(type) {}
+
+    // No content type or pattern is specified. Update all settings.
+    ContentSettingsDetails() : type_(CONTENT_SETTINGS_TYPE_DEFAULT) {}
 
     // The pattern whose settings have changed.
     const Pattern& pattern() const { return pattern_; }
 
-    // True if many settings changed at once.
-    bool update_all() const { return update_all_; }
+    // True if all settings should be updated for the given type.
+    bool update_all() const { return pattern_.AsString().empty(); }
+
+    // The type of the pattern whose settings have changed.
+    ContentSettingsType type() const { return type_; }
+
+    // True if all types should be updated. If update_all() is false, this will
+    // be false as well (although the reverse does not hold true).
+    bool update_all_types() const {
+      return CONTENT_SETTINGS_TYPE_DEFAULT == type_;
+    }
 
    private:
     Pattern pattern_;
-    bool update_all_;
+    ContentSettingsType type_;
   };
 
 
   typedef std::pair<Pattern, ContentSetting> PatternSettingPair;
   typedef std::vector<PatternSettingPair> SettingsForOneType;
 
   explicit HostContentSettingsMap(Profile* profile);
   ~HostContentSettingsMap();
 
   static void RegisterUserPrefs(PrefService* prefs);
@@ skipping 149 matching lines @@
 };
 
 // Stream operator so HostContentSettingsMap::Pattern can be used in
 // assertion statements.
 inline std::ostream& operator<<(
     std::ostream& out, const HostContentSettingsMap::Pattern& pattern) {
   return out << pattern.AsString();
 }
 
 #endif  // CHROME_BROWSER_HOST_CONTENT_SETTINGS_MAP_H_