aura-mus: add a drag representation image.

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 446 matching lines @@
 
   return client_window;
 }
 
 void SimpleWM::OnWmClientJankinessChanged(
     const std::set<aura::Window*>& client_windows,
     bool janky) {
   // Don't care.
 }
 
+void SimpleWM::OnWmBuildDragImage(const gfx::Point& cursor_location,
+                                  const SkBitmap& drag_image,
+                                  const gfx::Vector2d& drag_image_offset,
+                                  ui::mojom::DragEventSource source) {}
+
+void SimpleWM::OnWmMoveDragImage(const gfx::Point& cursor_location) {}
+
+void SimpleWM::OnWmDestroyDragImage() {}
+
 void SimpleWM::OnWmWillCreateDisplay(const display::Display& display) {
   screen_->display_list().AddDisplay(display,
                                      display::DisplayList::Type::PRIMARY);
 }
 
 void SimpleWM::OnWmNewDisplay(
     std::unique_ptr<aura::WindowTreeHostMus> window_tree_host,
     const display::Display& display) {
   // Only handles a single root.
   DCHECK(!window_root_);
@@ skipping 101 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