aura-mus: Make StackAtTop() proxy to the window manager.

ui/aura/mus/window_tree_client.cc

 // Copyright 2014 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/aura/mus/window_tree_client.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <utility>
@@ skipping 1492 matching lines @@
   }
 
   if (!window_manager_delegate_->IsWindowActive(window->GetWindow())) {
     DVLOG(1) << "Non-active window requested deactivation.";
     return;
   }
 
   window_manager_delegate_->OnWmDeactivateWindow(window->GetWindow());
 }
 
+void WindowTreeClient::WmStackAtTop(uint32_t wm_change_id, uint32_t window_id) {
+  if (!window_manager_delegate_)
+    return;
+
+  WindowMus* window = GetWindowByServerId(window_id);
+  if (!window) {
+    DVLOG(1) << "Attempt to stack at top invalid window " << window_id;
+    if (window_manager_internal_client_)
+      window_manager_internal_client_->WmResponse(wm_change_id, false);
+    return;
+  }
+
+  Window* parent = window->GetWindow()->parent();
+  parent->StackChildAtTop(window->GetWindow());
+
+  if (window_manager_internal_client_)
+    window_manager_internal_client_->WmResponse(wm_change_id, true);
+}
+
 void WindowTreeClient::OnAccelerator(uint32_t ack_id,
                                      uint32_t accelerator_id,
                                      std::unique_ptr<ui::Event> event) {
   DCHECK(event);
   const ui::mojom::EventResult result =
       window_manager_delegate_->OnAccelerator(accelerator_id, *event.get());
   if (ack_id && window_manager_internal_client_)
     window_manager_internal_client_->OnAcceleratorAck(ack_id, result);
 }
 
@@ skipping 228 matching lines @@
   return ScheduleInFlightChange(base::MakeUnique<InFlightCaptureChange>(
       this, capture_synchronizer_.get(), window));
 }
 
 uint32_t WindowTreeClient::CreateChangeIdForFocus(WindowMus* window) {
   return ScheduleInFlightChange(base::MakeUnique<InFlightFocusChange>(
       this, focus_synchronizer_.get(), window));
 }
 
 }  // namespace aura