mus: Use the new drag API to implement tab dragging in chrome.

ash/mus/window_manager.h

 // 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.
 
 #ifndef ASH_MUS_WINDOW_MANAGER_H_
 #define ASH_MUS_WINDOW_MANAGER_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <set>
 
+#include "ash/common/wm/wm_toplevel_window_event_handler.h"
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "components/mus/common/types.h"
 #include "components/mus/public/cpp/window_manager_delegate.h"
 #include "components/mus/public/cpp/window_observer.h"
 #include "components/mus/public/cpp/window_tree_client_delegate.h"
 #include "components/mus/public/interfaces/window_manager.mojom.h"
 
 namespace display {
 class Display;
@@ skipping 36 matching lines @@
   }
 
   shell::Connector* connector() { return connector_; }
 
   void SetScreenLocked(bool is_locked);
 
   // Creates a new top level window.
   ::mus::Window* NewTopLevelWindow(
       std::map<std::string, std::vector<uint8_t>>* properties);
 
+  // Called from WmMoveLoop to delete the object.
+  void OnWmMoveLoopCompleted(uint32_t change_id, bool succeeded);
+
   std::set<RootWindowController*> GetRootWindowControllers();
 
   void AddRootWindowsObserver(RootWindowsObserver* observer);
   void RemoveRootWindowsObserver(RootWindowsObserver* observer);
 
  private:
   friend class WmTestHelper;
 
   void AddAccelerators();
 
@@ skipping 51 matching lines @@
 
   std::unique_ptr<WmLookupMus> lookup_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowManager);
 };
 
 }  // namespace mus
 }  // namespace ash
 
 #endif  // ASH_MUS_WINDOW_MANAGER_H_