Add a per-tab preference to match WebSettings::images_enabled.

webkit/glue/webpreferences.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.
 //
 // A struct for managing webkit's settings.
 //
 // Adding new values to this class probably involves updating
 // WebKit::WebSettings, common/render_messages.cc, browser/tab_contents/
 // render_view_host_delegate_helper.cc, and browser/profiles/profile.cc.
 
@@ skipping 31 matching lines @@
   int default_font_size;
   int default_fixed_font_size;
   int minimum_font_size;
   int minimum_logical_font_size;
   std::string default_encoding;
   bool javascript_enabled;
   bool dart_enabled;
   bool web_security_enabled;
   bool javascript_can_open_windows_automatically;
   bool loads_images_automatically;
+  bool images_enabled;
   bool plugins_enabled;
   bool dom_paste_enabled;
   bool developer_extras_enabled;
   typedef std::vector<std::pair<std::string, std::string> >
       WebInspectorPreferences;
   WebInspectorPreferences inspector_settings;
   bool site_specific_quirks_enabled;
   bool shrinks_standalone_images_to_fit;
   bool uses_universal_detector;
   bool text_areas_are_resizable;
@@ skipping 55 matching lines @@
   // We try to keep the default values the same as the default values in
   // chrome, except for the cases where it would require lots of extra work for
   // the embedder to use the same default value.
   WebPreferences();
   ~WebPreferences();
 
   void Apply(WebKit::WebView* web_view) const;
 };
 
 #endif  // WEBKIT_GLUE_WEBPREFERENCES_H__