mus: Implement interwindow drag and drop

services/ui/ws/window_manager_state.h

 // 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.
 
 #ifndef SERVICES_UI_WS_WINDOW_MANAGER_STATE_H_
 #define SERVICES_UI_WS_WINDOW_MANAGER_STATE_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 43 matching lines @@
 
   bool SetCapture(ServerWindow* window, ClientSpecificId client_id);
   ServerWindow* capture_window() { return event_dispatcher_.capture_window(); }
   const ServerWindow* capture_window() const {
     return event_dispatcher_.capture_window();
   }
 
   void ReleaseCaptureBlockedByModalWindow(const ServerWindow* modal_window);
   void ReleaseCaptureBlockedByAnyModalWindow();
 
+  void SetDragDropSourceWindow(
+      DragSource* drag_source,
+      ServerWindow* window,
+      DragTargetConnection* source_connection,
+      int32_t drag_pointer,
+      mojo::Map<mojo::String, mojo::Array<uint8_t>> drag_data,
+      uint32_t drag_operation);
+  void EndDragDrop();
+
   void AddSystemModalWindow(ServerWindow* window);
 
   // TODO(sky): EventDispatcher is really an implementation detail and should
   // not be exposed.
   EventDispatcher* event_dispatcher() { return &event_dispatcher_; }
 
   // Returns true if this is the WindowManager of the active user.
   bool IsActive() const;
 
   void Activate(const gfx::Point& mouse_location_on_screen);
@@ skipping 149 matching lines @@
 
   base::WeakPtrFactory<WindowManagerState> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowManagerState);
 };
 
 }  // namespace ws
 }  // namespace ui
 
 #endif  // SERVICES_UI_WS_WINDOW_MANAGER_STATE_H_