mus drag and drop: return the completed effect to the caller.

services/ui/ws/test_utils.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 "services/ui/ws/test_utils.h"
 
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "cc/output/copy_output_request.h"
@@ skipping 363 matching lines @@
 
 void TestWindowTreeClient::OnDragLeave(uint32_t window) {}
 
 void TestWindowTreeClient::OnCompleteDrop(
     uint32_t window,
     uint32_t key_state,
     const gfx::Point& position,
     uint32_t effect_bitmask,
     const OnCompleteDropCallback& callback) {}
 
+void TestWindowTreeClient::OnDragCompletedReturnValue(uint32_t window,
+                                                      uint32_t action_taken) {}
+
 void TestWindowTreeClient::OnDragDropDone() {}
 
 void TestWindowTreeClient::OnChangeCompleted(uint32_t change_id, bool success) {
   if (record_on_change_completed_)
     tracker_.OnChangeCompleted(change_id, success);
 }
 
 void TestWindowTreeClient::RequestClose(uint32_t window_id) {}
 
 void TestWindowTreeClient::GetWindowManager(
@@ skipping 201 matching lines @@
     return nullptr;
   if (!tree->AddWindow(parent_client_id, client_window_id))
     return nullptr;
   *client_id = client_window_id;
   return tree->GetWindowByClientId(client_window_id);
 }
 
 }  // namespace test
 }  // namespace ws
 }  // namespace ui