events: Add some test.

ui/base/events/event_dispatcher.cc

+// Copyright (c) 2012 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/events/event_dispatcher.h"
+
+namespace ui {
+
+EventDispatcher::EventDispatcher() {
+}
+
+EventDispatcher::~EventDispatcher() {
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// EventDispatcher, private:
+
+EventResult EventDispatcher::DispatchEventToSingleHandler(EventHandler* handler,
+                                                          KeyEvent* event) {
+  return handler->OnKeyEvent(event);
+}
+
+EventResult EventDispatcher::DispatchEventToSingleHandler(EventHandler* handler,
+                                                          MouseEvent* event) {
+  return handler->OnMouseEvent(event);
+}
+
+EventResult EventDispatcher::DispatchEventToSingleHandler(EventHandler* handler,
+                                                          ScrollEvent* event) {
+  return handler->OnScrollEvent(event);
+}
+
+EventResult EventDispatcher::DispatchEventToSingleHandler(EventHandler* handler,
+                                                          TouchEvent* event) {
+  // TODO(sad): This needs fixing (especially for the QUEUED_ status).
+  TouchStatus status = handler->OnTouchEvent(event);
+  return status == ui::TOUCH_STATUS_UNKNOWN ? ER_UNHANDLED :
+         status == ui::TOUCH_STATUS_QUEUED_END ? ER_CONSUMED :
+                                                 ER_HANDLED;
+}
+
+EventResult EventDispatcher::DispatchEventToSingleHandler(EventHandler* handler,
+                                                          GestureEvent* event) {
+  return handler->OnGestureEvent(event);
+}
+
+}  // namespace ui