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

chrome/browser/ui/views/frame/browser_frame_ashwin.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/browser_frame_ashwin.h"
+
+#include "base/bind.h"
+#include "base/message_loop/message_loop.h"
+#include "chrome/browser/metro_utils/metro_chrome_win.h"
+#include "ui/aura/remote_root_window_host_win.h"
+
+BrowserFrameAshWin::BrowserFrameAshWin(BrowserFrame* browser_frame,
+                                       BrowserView* browser_view)
+    : BrowserFrameAsh(browser_frame, browser_view) {
+}
+
+BrowserFrameAshWin::~BrowserFrameAshWin() {
+}
+
+void BrowserFrameAshWin::OnWindowFocused(aura::Window* gained_focus,
+                                         aura::Window* lost_focus) {
+  BrowserFrameAsh::OnWindowFocused(gained_focus, lost_focus);
+  if (GetNativeWindow() != gained_focus)
+    return;
+
+  // If the activated window is in Metro mode, and the viewer process window is
+  // not in the foreground, activate Metro Chrome.
+  if (!aura::RemoteRootWindowHostWin::Instance()->IsForegroundWindow()) {
+    // PostTask because ActivateMetroChrome can not be called nested in another
+    // ::SendMessage().
+    base::MessageLoop::current()->PostTask(
+        FROM_HERE,
+        base::Bind(base::IgnoreResult(chrome::ActivateMetroChrome)));
+  }
+}