Revert: Remove WindowTreeClientDelegate::GetCaptureClient() and WindowTreeClient::GetCaptureClient()

mash/simple_wm/simple_wm.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 "mash/simple_wm/simple_wm.h"
 
 #include "base/observer_list.h"
 #include "base/strings/utf_string_conversions.h"
 #include "mash/simple_wm/move_event_handler.h"
 #include "ui/aura/client/aura_constants.h"
@@ skipping 381 matching lines @@
   // WindowTreeClients configured as the window manager should never get
   // OnEmbedRootDestroyed().
   NOTREACHED();
 }
 
 void SimpleWM::OnPointerEventObserved(const ui::PointerEvent& event,
                                       aura::Window* target) {
   // Don't care.
 }
 
+aura::client::CaptureClient* SimpleWM::GetCaptureClient() {
+  return wm_state_.capture_controller();
+}
+
 aura::PropertyConverter* SimpleWM::GetPropertyConverter() {
   return &property_converter_;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // SimpleWM, aura::WindowManagerDelegate implementation:
 
 void SimpleWM::SetWindowManagerClient(
     aura::WindowManagerClient* client) {
   window_manager_client_ = client;
@@ skipping 164 matching lines @@
 }
 
 void SimpleWM::OnWindowListViewItemActivated(aura::Window* window) {
   window->Show();
   aura::client::ActivationClient* activation_client =
       aura::client::GetActivationClient(window->GetRootWindow());
   activation_client->ActivateWindow(window);
 }
 
 }  // namespace simple_wm