Adding base URL to the frame committed message.

content/public/common/frame_navigate_params.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.
 
 #ifndef CONTENT_PUBLIC_COMMON_FRAME_NAVIGATE_PARAMS_H_
 #define CONTENT_PUBLIC_COMMON_FRAME_NAVIGATE_PARAMS_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 13 matching lines @@
 
   // Page ID of this navigation. The renderer creates a new unique page ID
   // anytime a new session history entry is created. This means you'll get new
   // page IDs for user actions, and the old page IDs will be reloaded when
   // iframes are loaded automatically.
   int32 page_id;
 
   // URL of the page being loaded.
   GURL url;
 
+  // The base URL for the page's document when the frame was committed. Empty if
+  // similar to 'url' above. Note that any base element in the page has not been
+  // parsed yet and is therefore not reflected.
+  // This is of interest when a MHTML file is loaded, as the base URL has been
+  // set to original URL of the site the MHTML represents.
+  GURL base_url;
+
   // URL of the referrer of this load. WebKit generates this based on the
   // source of the event that caused the load.
   GURL referrer;
 
   // The type of transition.
   PageTransition transition;
 
   // Lists the redirects that occurred on the way to the current page. This
   // vector has the same format as reported by the WebDataSource in the glue,
   // with the current page being the last one in the list (so even when
@@ skipping 14 matching lines @@
   // Contents MIME type of main frame.
   std::string contents_mime_type;
 
   // Remote address of the socket which fetched this resource.
   net::HostPortPair socket_address;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_FRAME_NAVIGATE_PARAMS_H_