aura-mus: wire up drag and drop.

services/ui/ws/window_tree.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 "services/ui/ws/window_tree.h"
 
 #include <stddef.h>
 
 #include <utility>
 
@@ skipping 1747 matching lines @@
     uint32_t change_id,
     Id source_window_id,
     const std::unordered_map<std::string, std::vector<uint8_t>>& drag_data,
     uint32_t drag_operation) {
   ServerWindow* window = GetWindowByClientId(ClientWindowId(source_window_id));
   bool success = window && access_policy_->CanInitiateDragLoop(window);
   if (!success || !ShouldRouteToWindowManager(window)) {
     // We need to fail this move loop change, otherwise the client will just be
     // waiting for |change_id|.
     DVLOG(1) << "PerformDragDrop failed (access denied).";
-    OnChangeCompleted(change_id, false);
+    client()->OnPerformDragDropCompleted(change_id, false,
+                                         mojom::kDropEffectNone);
     return;
   }
 
   WindowManagerDisplayRoot* display_root = GetWindowManagerDisplayRoot(window);
   if (!display_root) {
     // The window isn't parented. There's nothing to do.
     DVLOG(1) << "PerformDragDrop failed (window unparented).";
-    OnChangeCompleted(change_id, false);
+    client()->OnPerformDragDropCompleted(change_id, false,
+                                         mojom::kDropEffectNone);
     return;
   }
 
   if (window_server_->in_move_loop() || window_server_->in_drag_loop()) {
     // Either the window manager is servicing a window drag or we're servicing
     // a drag and drop operation. We can't start a second drag.
     DVLOG(1) << "PerformDragDrop failed (already performing a drag).";
-    OnChangeCompleted(change_id, false);
+    client()->OnPerformDragDropCompleted(change_id, false,
+                                         mojom::kDropEffectNone);
     return;
   }
 
   // TODO(erg): Dealing with |drag_representation| is hard, so we're going to
   // deal with that later.
 
   // Here, we need to dramatically change how the mouse pointer works. Once
   // we've started a drag drop operation, cursor events don't go to windows as
   // normal.
   WindowManagerState* wms = display_root->window_manager_state();
@@ skipping 381 matching lines @@
   client()->OnCompleteDrop(client_window_id.id, event_flags, cursor_offset,
                            effect_bitmask, callback);
 }
 
 void WindowTree::PerformOnDragDropDone() {
   client()->OnDragDropDone();
 }
 
 }  // namespace ws
 }  // namespace ui