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

ui/aura/remote_root_window_host_win.cc

Index: ui/aura/remote_root_window_host_win.cc
diff --git a/ui/aura/remote_root_window_host_win.cc b/ui/aura/remote_root_window_host_win.cc
index 326f9cffbb0c167f52fd012b95eccae04b24876c..95942b4012bc72f273b00b0da1f9226715a5300a 100644
--- a/ui/aura/remote_root_window_host_win.cc
+++ b/ui/aura/remote_root_window_host_win.cc
@@ -295,6 +295,10 @@ void RemoteRootWindowHostWin::HandleSelectFolder(
   host_->Send(new MetroViewerHostMsg_DisplaySelectFolder(title));
 }
 
+bool RemoteRootWindowHostWin::IsForegroundWindow() {
+  return ::GetForegroundWindow() == remote_window_;
+}
+
 Window* RemoteRootWindowHostWin::GetAshWindow() {
   return GetRootWindow()->window();
 }