Tab dragging as implemented as a mus API.

ash/mus/window_manager.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 "ash/mus/window_manager.h"
 
 #include <stdint.h>
 
 #include <utility>
 
@@ skipping 222 matching lines @@
   switch (id) {
     case kWindowSwitchAccelerator:
       window_manager_client()->ActivateNextWindow();
       break;
     default:
       window_manager_app_->OnAccelerator(id, event);
       break;
   }
 }
 
+void WindowManager::OnWmPerformMoveLoop(
+    ::mus::Window* window,
+    ::mus::mojom::MoveLoopSource source,
+    const gfx::Point& cursor_location,
+    const base::Callback<void(bool)>& on_done) {
+  NOTIMPLEMENTED();
+}
+
+void WindowManager::OnWmCancelMoveLoop(::mus::Window* window) {
+  NOTIMPLEMENTED();
+}
+
 }  // namespace mus
 }  // namespace ash