Delegating the "are images allowed" decision to renderer.

chrome/common/render_messages.h

Index: chrome/common/render_messages.h
diff --git a/chrome/common/render_messages.h b/chrome/common/render_messages.h
index b32e7fc328654592b017aa89568a141651c69359..729f4de01ca3e1b5e71e9ce7a8f35a79f692c2af 100644
--- a/chrome/common/render_messages.h
+++ b/chrome/common/render_messages.h
@@ -85,6 +85,14 @@ struct ParamTraits<ContentSettings> {
   static void Log(const param_type& p, std::string* l);
 };
 
+template <>
+struct ParamTraits<ContentSettingsPattern> {
+  typedef ContentSettingsPattern param_type;
+  static void Write(Message* m, const param_type& p);
+  static bool Read(const Message* m, void** iter, param_type* r);
+  static void Log(const param_type& p, std::string* l);
+};
+
 }  // namespace IPC
 
 #endif  // CHROME_COMMON_RENDER_MESSAGES_H_
@@ -193,6 +201,9 @@ IPC_MESSAGE_CONTROL2(ChromeViewMsg_SetContentSettingsForCurrentURL,
 IPC_MESSAGE_CONTROL1(ChromeViewMsg_SetDefaultContentSettings,
                      ContentSettings /* content_settings */)
 
+IPC_MESSAGE_CONTROL1(ChromeViewMsg_SetImageSettings,
+                     ContentSettingRules /* rules */)
+
 // Tells the render view to load all blocked plugins.
 IPC_MESSAGE_ROUTED0(ChromeViewMsg_LoadBlockedPlugins)