Implement a MusBrowserFrame.

chrome/browser/ui/views/frame/native_browser_frame_factory_aurawin.cc

 // Copyright 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 "chrome/browser/ui/views/frame/native_browser_frame_factory.h"
 
 #include "ash/shell.h"
+#include "chrome/browser/mojo_runner_util.h"
 #include "chrome/browser/ui/views/frame/browser_frame_ashwin.h"
 #include "chrome/browser/ui/views/frame/desktop_browser_frame_aura.h"
+#include "chrome/browser/ui/views/frame/mus_browser_frame.h"
 
 NativeBrowserFrame* NativeBrowserFrameFactory::Create(
     BrowserFrame* browser_frame,
     BrowserView* browser_view) {
+  if (IsRunningInMojoRunner())
+    return new MusBrowserFrame(browser_frame, browser_view);
+
   if (ShouldCreateForAshDesktop(browser_view))
     return new BrowserFrameAshWin(browser_frame, browser_view);
 
   return new DesktopBrowserFrameAura(browser_frame, browser_view);
 }
 
 // static
 chrome::HostDesktopType NativeBrowserFrameFactory::AdjustHostDesktopType(
     chrome::HostDesktopType desktop_type) {
   if (ash::Shell::HasInstance())
     return chrome::HOST_DESKTOP_TYPE_ASH;
 
   return desktop_type;
 }