Changes how window manager obtains WindowTree from mus

components/mus/public/cpp/lib/in_flight_change.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 "components/mus/public/cpp/lib/in_flight_change.h"
 
 #include "components/mus/public/cpp/lib/window_private.h"
 #include "components/mus/public/cpp/window_tree_client.h"
 
 namespace mus {
@@ skipping 33 matching lines @@
 CrashInFlightChange::CrashInFlightChange(Window* window, ChangeType type)
     : InFlightChange(window, type) {}
 
 CrashInFlightChange::~CrashInFlightChange() {}
 
 void CrashInFlightChange::SetRevertValueFrom(const InFlightChange& change) {
   CHECK(false);
 }
 
 void CrashInFlightChange::ChangeFailed() {
+  DLOG(ERROR) << "changed failed, type=" << static_cast<int>(change_type());
   CHECK(false);
 }
 
 void CrashInFlightChange::Revert() {
   CHECK(false);
 }
 
 // InFlightWindowChange -------------------------------------------------------
 
 InFlightWindowTreeClientChange::InFlightWindowTreeClientChange(
@@ skipping 146 matching lines @@
 
 InFlightSetModalChange::~InFlightSetModalChange() {}
 
 void InFlightSetModalChange::SetRevertValueFrom(const InFlightChange& change) {}
 
 void InFlightSetModalChange::Revert() {
   WindowPrivate(window()).LocalUnsetModal();
 }
 
 }  // namespace mus