events: Clean up dispatching code for touch-events.

ui/base/events/event_constants.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_constants.h"
+
+#include "base/logging.h"
+
+namespace ui {
+
+EventResult EventResultFromTouchStatus(TouchStatus status) {
+  switch (status) {
+    case TOUCH_STATUS_UNKNOWN:
+      return ER_UNHANDLED;
+
+    case TOUCH_STATUS_START:
+    case TOUCH_STATUS_CONTINUE:
+    case TOUCH_STATUS_END:
+      return ER_CONSUMED;
+
+    case TOUCH_STATUS_QUEUED:
+    case TOUCH_STATUS_QUEUED_END:
+      return ER_ASYNC;
+  }
+
+  NOTREACHED();
+  return ER_UNHANDLED;
+}
+
+}  // namespace ui