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

content/shell/shell_switches.cc

Index: content/shell/shell_switches.cc
diff --git a/content/shell/shell_switches.cc b/content/shell/shell_switches.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2a8649e53b60ab7e4c81fbf3a3241c720a8d02ec
--- /dev/null
+++ b/content/shell/shell_switches.cc
@@ -0,0 +1,12 @@
+// 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_switches.h"
+
+namespace switches {
+
+// Request pages to be dumped as text once they finished loading.
+const char kTree[] = "tree";

[jam, 2012/01/26 18:47:34]

nit: i think when looking at DRT, it's very clear in that context what --notree
means. here because content_shell does much more than just dump render tree, can
we make this --dump-render-tree? that would make it obvious to everyone

[jochen (gone - plz use gerrit), 2012/01/27 08:49:56]

Done.

+
+}  // namespace switches