Enables passing initial properties to top level window creation

ash/host/ash_window_tree_host_platform.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 "ash/host/ash_window_tree_host_platform.h"
 
 #include <utility>
 
 #include "ash/host/root_window_transformer.h"
 #include "ash/host/transformer_helper.h"
@@ skipping 15 matching lines @@
 namespace ash {
 
 AshWindowTreeHostPlatform::AshWindowTreeHostPlatform(
     const gfx::Rect& initial_bounds)
     : aura::WindowTreeHostPlatform(initial_bounds), transformer_helper_(this) {
   transformer_helper_.Init();
 }
 
 AshWindowTreeHostPlatform::AshWindowTreeHostPlatform()
     : transformer_helper_(this) {
+  CreateCompositor();
   transformer_helper_.Init();
 }
 
 AshWindowTreeHostPlatform::~AshWindowTreeHostPlatform() {}
 
 void AshWindowTreeHostPlatform::ToggleFullScreen() {
   NOTIMPLEMENTED();
 }
 
 bool AshWindowTreeHostPlatform::ConfineCursorToRootWindow() {
@@ skipping 78 matching lines @@
 #if defined(USE_OZONE)
   DCHECK(ui::OzonePlatform::GetInstance()->GetInputController());
 
   // Temporarily pause tap-to-click when the cursor is hidden.
   ui::OzonePlatform::GetInstance()->GetInputController()->SetTapToClickPaused(
       state);
 #endif
 }
 
 }  // namespace ash