mus: Implement ScreenMus::GetCursorScreenPoint().

components/mus/public/cpp/tests/test_window_tree.cc

 // 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.
 
 #include "components/mus/public/cpp/tests/test_window_tree.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace mus {
 
@@ skipping 134 matching lines @@
 
 void TestWindowTree::OnWindowInputEventAck(uint32_t event_id,
                                            mus::mojom::EventResult result) {
   EXPECT_FALSE(acked_events_.count(event_id));
   acked_events_.insert(event_id);
 }
 
 void TestWindowTree::GetWindowManagerClient(
     mojo::AssociatedInterfaceRequest<mojom::WindowManagerClient> internal) {}
 
+void TestWindowTree::GetCursorLocationMemory(
+    const GetCursorLocationMemoryCallback& callback) {
+  callback.Run(mojo::ScopedSharedBufferHandle());
+}
+
 }  // namespace mus