mash: Relay some Chrome aura window properties to Ash.

ui/views/mus/mus_client.cc

 // Copyright 2016 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 "ui/views/mus/mus_client.h"
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "base/threading/thread.h"
 #include "components/discardable_memory/client/client_discardable_shared_memory_manager.h"
@@ skipping 208 matching lines @@
 }
 
 void MusClient::AddObserver(MusClientObserver* observer) {
   observer_list_.AddObserver(observer);
 }
 
 void MusClient::RemoveObserver(MusClientObserver* observer) {
   observer_list_.RemoveObserver(observer);
 }
 
+void MusClient::OnWindowPropertyChanged(aura::Window* window, const void* key) {
+  for (auto& observer : observer_list_)
+    observer.OnWindowPropertyChanged(window, key);
+}
+
 void MusClient::OnEmbed(
     std::unique_ptr<aura::WindowTreeHostMus> window_tree_host) {
   NOTREACHED();
 }
 
 void MusClient::OnLostConnection(aura::WindowTreeClient* client) {}
 
 void MusClient::OnEmbedRootDestroyed(
     aura::WindowTreeHostMus* window_tree_host) {
   static_cast<DesktopWindowTreeHostMus*>(window_tree_host)
@@ skipping 30 matching lines @@
       return root->GetTopWindowContainingPoint(relative_point);
   }
   return nullptr;
 }
 
 std::unique_ptr<OSExchangeData::Provider> MusClient::BuildProvider() {
   return base::MakeUnique<aura::OSExchangeDataProviderMus>();
 }
 
 }  // namespace views