Delegating the "are images allowed" decision to renderer.

chrome/browser/content_settings/host_content_settings_map.h

 // Copyright (c) 2011 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_CONTENT_SETTINGS_HOST_CONTENT_SETTINGS_MAP_H_
 #define CHROME_BROWSER_CONTENT_SETTINGS_HOST_CONTENT_SETTINGS_MAP_H_
 #pragma once
@@ skipping 106 matching lines @@
   // must be a non-NULL outparam. If this map was created for the
   // incognito profile, it will only return those settings differing from
   // the main map. For ContentSettingsTypes that require an resource identifier
   // to be specified, the |resource_identifier| must be non-empty.
   //
   // This may be called on any thread.
   void GetSettingsForOneType(ContentSettingsType content_type,
                              const std::string& resource_identifier,
                              SettingsForOneType* settings) const;
 
+  // For a given content type, returns all patterns with a non-default setting,
+  // mapped to their actual setting, in the order in which they would be checked
+  // by GetContentSetting.
+  void GetConcatenatedSettingsForOneType(ContentSettingsType content_type,
+                                         const std::string& resource_identifier,
+                                         ContentSettingRules* rules) const;
+
   // Sets the default setting for a particular content type. This method must
   // not be invoked on an incognito map.
   //
   // This should only be called on the UI thread.
   void SetDefaultContentSetting(ContentSettingsType content_type,
                                 ContentSetting setting);
 
   // Sets the content setting for the given patterns and content type.
   // Setting the value to CONTENT_SETTING_DEFAULT causes the default setting
   // for that type to be used when loading pages matching this pattern. For
@@ skipping 122 matching lines @@
   mutable base::Lock lock_;
 
   // Misc global settings.
   bool block_third_party_cookies_;
   bool is_block_third_party_cookies_managed_;
 
   DISALLOW_COPY_AND_ASSIGN(HostContentSettingsMap);
 };
 
 #endif  // CHROME_BROWSER_CONTENT_SETTINGS_HOST_CONTENT_SETTINGS_MAP_H_