Plumb the referrer throughout the OpenURL APIs....

chrome/common/render_messages_internal.h

 // Copyright (c) 2006-2008 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.
 
 // This header is meant to be included in multiple passes, hence no traditional
 // header guard.
 // See ipc_message_macros.h for explanation of the macros and passes.
 
 #include <string>
 #include <vector>
@@ skipping 717 matching lines @@
                       int32 /* page_id */,
                       GURL /* url of the favicon */)
 
   // Used to tell the parent that the user right clicked on an area of the
   // content area, and a context menu should be shown for it. The params
   // object contains information about the node(s) that were selected when the
   // user right clicked.
   IPC_MESSAGE_ROUTED1(ViewHostMsg_ContextMenu, ViewHostMsg_ContextMenu_Params)
 
   // Request that the given URL be opened in the specified manner.
-  IPC_MESSAGE_ROUTED2(ViewHostMsg_OpenURL,
+  IPC_MESSAGE_ROUTED3(ViewHostMsg_OpenURL,
                       GURL /* url */,
+                      GURL /* referrer */,
                       WindowOpenDisposition /* disposition */)
 
   // Following message is used to communicate the values received by the
   // callback binding the JS to Cpp.
   // An instance of browser that has an automation host listening to it can
   // have a javascript send a native value (string, number, boolean) to the
   // listener in Cpp. (DomAutomationController)
   IPC_MESSAGE_ROUTED2(ViewHostMsg_DomOperationResponse,
                       std::string  /* json_string */,
                       int  /* automation_id */)
@@ skipping 308 matching lines @@
   // beforeunload or unload handler.
   IPC_MESSAGE_ROUTED1(ViewHostMsg_UnloadListenerChanged,
                       bool /* has_listener */)
 
   // Returns the window location of the window this widget is embeded in.
   IPC_SYNC_MESSAGE_ROUTED1_1(ViewHostMsg_GetRootWindowRect,
                              HWND /* window */,
                              gfx::Rect /* Out: Window location */)
 
 IPC_END_MESSAGES(ViewHost)