Add option --dump-render-tree to content_shell to dump the render tree as text.

content/shell/shell_content_browser_client.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_content_browser_client.h"
 
 #include "base/file_path.h"
 #include "content/shell/shell.h"
 #include "content/shell/shell_browser_main.h"
 #include "content/shell/shell_devtools_delegate.h"
+#include "content/shell/shell_render_view_host_observer.h"
 #include "googleurl/src/gurl.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "webkit/glue/webpreferences.h"
 
 #if defined(OS_WIN)
 #include "content/browser/tab_contents/tab_contents.h"
 #include "content/browser/tab_contents/tab_contents_view_win.h"
 #include "content/common/view_messages.h"
 #elif defined(OS_LINUX)
 #include "content/browser/tab_contents/tab_contents_view_gtk.h"
@@ skipping 24 matching lines @@
   return new TabContentsViewWin(web_contents);
 #elif defined(OS_LINUX)
   return new TabContentsViewGtk(web_contents, NULL);
 #else
   return NULL;
 #endif
 }
 
 void ShellContentBrowserClient::RenderViewHostCreated(
     RenderViewHost* render_view_host) {
+  new ShellRenderViewHostObserver(render_view_host);
 }
 
 void ShellContentBrowserClient::RenderProcessHostCreated(
     RenderProcessHost* host) {
 }
 
 WebUIControllerFactory* ShellContentBrowserClient::GetWebUIControllerFactory() {
   return NULL;
 }
 
@@ skipping 255 matching lines @@
 #endif
 
 #if defined(USE_NSS)
 crypto::CryptoModuleBlockingPasswordDelegate*
     ShellContentBrowserClient::GetCryptoPasswordDelegate(const GURL& url) {
   return NULL;
 }
 #endif
 
 }  // namespace content