[win8] Force browsers created with Chrome in Metro mode to be on the Ash desktop.

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