When Chrome hands off a URL to be opened by the external host by the ViewHost...

chrome/test/automation/tab_proxy.cc

 // 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.
 
 #include "chrome/test/automation/tab_proxy.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "chrome/common/json_value_serializer.h"
@@ skipping 90 matching lines @@
     sender_->SendWithTimeout(
         new AutomationMsg_NavigateToURLBlockUntilNavigationsComplete(
             0, handle_, url, number_of_navigations, &navigate_response),
             timeout_ms, is_timeout);
   }
 
   return navigate_response;
 }
 
 AutomationMsg_NavigationResponseValues TabProxy::NavigateInExternalTab(
-    const GURL& url) {
+    const GURL& url, const GURL& referrer) {
   if (!is_valid())
     return AUTOMATION_MSG_NAVIGATION_ERROR;
 
   AutomationMsg_NavigationResponseValues rv = AUTOMATION_MSG_NAVIGATION_ERROR;
-  sender_->Send(new AutomationMsg_NavigateInExternalTab(0, handle_, url, &rv));
+  sender_->Send(new AutomationMsg_NavigateInExternalTab(0, handle_, url,
+                                                        referrer, &rv));
   return rv;
 }
 
 AutomationMsg_NavigationResponseValues TabProxy::NavigateExternalTabAtIndex(
     int index) {
   if (!is_valid())
     return AUTOMATION_MSG_NAVIGATION_ERROR;
 
   AutomationMsg_NavigationResponseValues rv = AUTOMATION_MSG_NAVIGATION_ERROR;
   sender_->Send(new AutomationMsg_NavigateExternalTabAtIndex(0, handle_, index,
@@ skipping 594 matching lines @@
   AutoLock lock(list_lock_);
   observers_list_.RemoveObserver(observer);
 }
 
 // Called on Channel background thread, if TabMessages filter is installed.
 void TabProxy::OnMessageReceived(const IPC::Message& message) {
   AutoLock lock(list_lock_);
   FOR_EACH_OBSERVER(TabProxyDelegate, observers_list_,
                     OnMessageReceived(this, message));
 }