[content shell] run headless when in layout test mode

content/shell/shell.cc

 // Copyright (c) 2012 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 "content/shell/shell.h"
 
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "base/message_loop.h"
 #include "base/path_service.h"
@@ skipping 27 matching lines @@
 
 std::vector<Shell*> Shell::windows_;
 base::Callback<void(Shell*)> Shell::shell_created_callback_;
 
 bool Shell::quit_message_loop_ = true;
 
 Shell::Shell(WebContents* web_contents)
     : dev_tools_(NULL),
       is_fullscreen_(false),
       window_(NULL),
-      url_edit_view_(NULL)
+      url_edit_view_(NULL),
 #if defined(OS_WIN) && !defined(USE_AURA)
-      , default_edit_wnd_proc_(0)
+      default_edit_wnd_proc_(0),
 #endif
-  {
+      headless_(false) {
+  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
+  if (command_line.HasSwitch(switches::kDumpRenderTree) &&
+      !command_line.HasSwitch(switches::kShowContentShell)) {
+    headless_ = true;
+  }
   registrar_.Add(this, NOTIFICATION_WEB_CONTENTS_TITLE_UPDATED,
       Source<WebContents>(web_contents));
   windows_.push_back(this);
 
   if (!shell_created_callback_.is_null()) {
     shell_created_callback_.Run(this);
     shell_created_callback_.Reset();
   }
 }
 
@@ skipping 232 matching lines @@
         Details<std::pair<NavigationEntry*, bool> >(details).ptr();
 
     if (title->first) {
       string16 text = title->first->GetTitle();
       PlatformSetTitle(text);
     }
   }
 }
 
 }  // namespace content