Enables passing initial properties to top level window creation

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 "services/service_manager/public/cpp/connection.h"
 #include "services/service_manager/public/cpp/connector.h"
@@ skipping 54 matching lines @@
     return nullptr;
   }
 
   DesktopNativeWidgetAura* native_widget =
       new DesktopNativeWidgetAura(delegate);
   if (init_params.desktop_window_tree_host) {
     native_widget->SetDesktopWindowTreeHost(
         base::WrapUnique(init_params.desktop_window_tree_host));
   } else {
     native_widget->SetDesktopWindowTreeHost(
-        base::MakeUnique<DesktopWindowTreeHostMus>(delegate, native_widget));
+        base::MakeUnique<DesktopWindowTreeHostMus>(delegate, native_widget,
+                                                   init_params));
   }
   return native_widget;
 }
 
 MusClient::MusClient(service_manager::Connector* connector,
                      const service_manager::Identity& identity,
                      scoped_refptr<base::SingleThreadTaskRunner> io_task_runner)
     : connector_(connector), identity_(identity) {
   DCHECK(!instance_);
   instance_ = this;
@@ skipping 74 matching lines @@
       return root->GetTopWindowContainingPoint(relative_point);
   }
   return nullptr;
 }
 
 std::unique_ptr<OSExchangeData::Provider> MusClient::BuildProvider() {
   return base::MakeUnique<aura::OSExchangeDataProviderMus>();
 }
 
 }  // namespace views