Set the unique_event_id when converting from TouchEvent to WebTouchEvent

ui/events/base_event_utils.h

Index: ui/events/base_event_utils.h
diff --git a/ui/events/base_event_utils.h b/ui/events/base_event_utils.h
new file mode 100644
index 0000000000000000000000000000000000000000..9907faeecc0f51b8b5f9b358a0c90520e957f404
--- /dev/null
+++ b/ui/events/base_event_utils.h
@@ -0,0 +1,18 @@
+// 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.
+
+#ifndef UI_EVENTS_BASE_EVENT_UTILS_H_
+#define UI_EVENTS_BASE_EVENT_UTILS_H_
+
+#include "base/basictypes.h"
+#include "ui/events/events_base_export.h"
+
+namespace ui {
+
+// Generate an unique identifier for events.
+EVENTS_BASE_EXPORT uint32 GetNextTouchEventId();
+

[sadrul, 2015/04/23 16:56:23]

Why not add this in event_utils.h instead?

[tdresser, 2015/04/23 17:13:19]

Is event_utils.h included on Android?

[sadrul, 2015/04/23 17:16:28]

If it's not, can it be?

[lanwei, 2015/04/24 20:21:09]

I add a comment to clarify that event_utils.h will not be included in Android,
and base_event_utils.h can be used in all the platforms.

+}  // namespace ui
+
+#endif  // UI_EVENTS_BASE_EVENT_UTILS_H_