Add window manager component.

wm/shell/shell_main.cc

Index: wm/shell/shell_main.cc
diff --git a/wm/shell/shell_main.cc b/wm/shell/shell_main.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c587347ec1b5cef0a44823fac51d3da50eb274ad
--- /dev/null
+++ b/wm/shell/shell_main.cc
@@ -0,0 +1,11 @@
+// Copyright (c) 2013 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/public/app/content_main.h"
+#include "wm/shell/content_client/shell_main_delegate.h"
+
+int main(int argc, const char** argv) {
+  wm::shell::ShellMainDelegate delegate;
+  return content::ContentMain(argc, argv, &delegate);
+}