Make it possible to launch chrome --mash with ozone_platform={wayland|x11}, chromeos=0

chrome/browser/ui/ozone_stubs.h

Index: chrome/browser/ui/ozone_stubs.h
diff --git a/chrome/browser/ui/ozone_stubs.h b/chrome/browser/ui/ozone_stubs.h
new file mode 100644
index 0000000000000000000000000000000000000000..6f483a019b14590a588c4fe112faf3ac3599b000
--- /dev/null
+++ b/chrome/browser/ui/ozone_stubs.h
@@ -0,0 +1,16 @@
+// Copyright (c) 2016 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.
+//
+#ifndef CHROME_BROWSER_UI_OZONE_STUBS_H_
+#define CHROME_BROWSER_UI_OZONE_STUBS_H_
+
+namespace ui {
+
+// Determine whether we should default to native decorations or the custom
+// frame based on the currently-running window manager.
+bool GetCustomFramePrefDefault();
+
+}  // namespace ui
+
+#endif  // CHROME_BROWSER_UI_OZONE_STUBS_H_