Implement async touchmove dispatch during scroll

content/renderer/input/input_event_filter.cc

 // 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.
 
 #include "content/renderer/input/input_event_filter.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/location.h"
@@ skipping 155 matching lines @@
         TRACE_EVENT_SCOPE_THREAD);
     IPC::Message new_msg = InputMsg_HandleInputEvent(
         routing_id, event, latency_info, is_keyboard_shortcut);
     main_loop_->PostTask(
         FROM_HERE,
         base::Bind(&InputEventFilter::ForwardToMainListener,
                    this, new_msg));
     return;
   }
 
-  if (!WebInputEventTraits::IgnoresAckDisposition(event->type))
+  if (!WebInputEventTraits::IgnoresAckDisposition(*event))
     SendACK(event->type, ack, latency_info, routing_id);
 }
 
 void InputEventFilter::SendACK(blink::WebInputEvent::Type type,
                                InputEventAckState ack_result,
                                const ui::LatencyInfo& latency_info,
                                int routing_id) {
   SendMessage(InputHostMsg_HandleInputEvent_ACK(
       routing_id, type, ack_result, latency_info));
 }
 
 void InputEventFilter::SendMessage(const IPC::Message& message) {
   DCHECK(target_loop_->BelongsToCurrentThread());
 
   io_loop_->PostTask(
       FROM_HERE,
       base::Bind(&InputEventFilter::SendMessageOnIOThread, this, message));
 }
 
 void InputEventFilter::SendMessageOnIOThread(const IPC::Message& message) {
   DCHECK(io_loop_->BelongsToCurrentThread());
 
   if (!sender_)
     return;  // Filter was removed.
 
   sender_->Send(new IPC::Message(message));
 }
 
 }  // namespace content