Converts ash to use aura-mus

ash/aura/wm_window_aura.cc

Index: ash/aura/wm_window_aura.cc
diff --git a/ash/aura/wm_window_aura.cc b/ash/aura/wm_window_aura.cc
index ce8d0e5491dd3ec4a3c631a252a25e6a1d58907d..62dc34ac6e1a176fb967a565c5358f3f14867513 100644
--- a/ash/aura/wm_window_aura.cc
+++ b/ash/aura/wm_window_aura.cc
@@ -29,6 +29,7 @@
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/focus_client.h"
 #include "ui/aura/client/window_parenting_client.h"
+#include "ui/aura/env.h"
 #include "ui/aura/layout_manager.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_delegate.h"
@@ -108,6 +109,7 @@ const WmWindow* WmWindowAura::Get(const aura::Window* window) {
   const WmWindow* wm_window = window->GetProperty(kWmWindowKey);
   if (wm_window)
     return wm_window;
+  DCHECK_EQ(aura::Env::Mode::LOCAL, aura::Env::GetInstance()->mode());
   // WmWindowAura is owned by the aura::Window.
   // TODO(sky): fix constness.
   return new WmWindowAura(const_cast<aura::Window*>(window));
@@ -838,6 +840,11 @@ void WmWindowAura::RemoveLimitedPreTargetHandler(ui::EventHandler* handler) {
   window_->RemovePreTargetHandler(handler);
 }
 
+// static
+bool WmWindowAura::HasInstance(const aura::Window* window) {
+  return window->GetProperty(kWmWindowKey) != nullptr;
+}
+
 void WmWindowAura::OnWindowHierarchyChanging(
     const HierarchyChangeParams& params) {
   WmWindowObserver::TreeChangeParams wm_params;