Implement async touchmove dispatch during scroll

content/common/input/web_input_event_traits.h

 // Copyright 2013 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 CONTENT_COMMON_INPUT_WEB_INPUT_EVENT_TRAITS_H_
 #define CONTENT_COMMON_INPUT_WEB_INPUT_EVENT_TRAITS_H_
 
 #include "base/basictypes.h"
 #include "content/common/input/scoped_web_input_event.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 
 namespace content {
 
 // Utility class for performing operations on and with WebInputEvents.
 class CONTENT_EXPORT WebInputEventTraits {
  public:
   static const char* GetName(blink::WebInputEvent::Type type);
   static size_t GetSize(blink::WebInputEvent::Type type);
   static ScopedWebInputEvent Clone(const blink::WebInputEvent& event);
   static void Delete(blink::WebInputEvent* event);
   static bool CanCoalesce(const blink::WebInputEvent& event_to_coalesce,
                           const blink::WebInputEvent& event);
   static void Coalesce(const blink::WebInputEvent& event_to_coalesce,
                        blink::WebInputEvent* event);
   static bool IgnoresAckDisposition(blink::WebInputEvent::Type type);

[Rick Byers, 2014/04/22 14:52:59]

Can we get rid of this type-only version (to avoid mistakes)?  If that's too
painful, let's have it CHECK that the provided event isn't one of the event
types that may or may not ignore ACK.

[jdduke (slow), 2014/04/23 19:57:41]

I think we can. There's one place that still uses it, but it's only as a sanity
check.

+  static bool IgnoresAckDisposition(const blink::WebInputEvent& event);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_INPUT_WEB_INPUT_EVENT_TRAITS_H_