[Ozone] Proper cursor support for multi-monitor configurations

ui/base/cursor/ozone/cursor_factory_ozone.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 "ui/base/cursor/ozone/cursor_factory_ozone.h"
 
 #include "base/logging.h"
 
 namespace ui {
 
@@ skipping 29 matching lines @@
 
 void CursorFactoryOzone::UnrefImageCursor(PlatformCursor cursor) {
   NOTIMPLEMENTED();
 }
 
 void CursorFactoryOzone::SetCursor(gfx::AcceleratedWidget widget,
                                    PlatformCursor cursor) {
   NOTIMPLEMENTED();
 }
 
+gfx::AcceleratedWidget CursorFactoryOzone::GetActiveWindow() {
+  NOTIMPLEMENTED();
+  return 0;
+}
+
 }  // namespace ui