Enables passing initial properties to top level window creation

ui/views/mus/window_tree_host_mus.cc

 // Copyright 2015 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/window_tree_host_mus.h"
 
 #include "base/memory/ptr_util.h"
 #include "services/ui/public/cpp/window.h"
 #include "ui/aura/env.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/events/event.h"
 #include "ui/platform_window/stub/stub_window.h"
 #include "ui/views/mus/input_method_mus.h"
 #include "ui/views/mus/native_widget_mus.h"
 
 namespace views {
 
 namespace {
 static uint32_t accelerated_widget_count = 1;
 
 bool IsUsingTestContext() {
   return aura::Env::GetInstance()->context_factory()->DoesCreateTestContexts();
 }
 
-}
+}  // namespace
 
 ////////////////////////////////////////////////////////////////////////////////
 // WindowTreeHostMus, public:
 
 WindowTreeHostMus::WindowTreeHostMus(NativeWidgetMus* native_widget,
                                      ui::Window* window)
     : native_widget_(native_widget) {
+  CreateCompositor();
   gfx::AcceleratedWidget accelerated_widget;
   if (IsUsingTestContext()) {
     accelerated_widget = gfx::kNullAcceleratedWidget;
   } else {
     // We need accelerated widget numbers to be different for each
     // window and fit in the smallest sizeof(AcceleratedWidget) uint32_t
     // has this property.
 #if defined(OS_WIN) || defined(OS_ANDROID)
     accelerated_widget =
         reinterpret_cast<gfx::AcceleratedWidget>(accelerated_widget_count++);
@@ skipping 46 matching lines @@
 void WindowTreeHostMus::OnCloseRequest() {
   OnHostCloseRequested();
 }
 
 gfx::ICCProfile WindowTreeHostMus::GetICCProfileForCurrentDisplay() {
   // TODO: This should read the profile from mus. crbug.com/647510
   return gfx::ICCProfile();
 }
 
 }  // namespace views