Don't pass touches to gesture recognizer for async acks.

ui/events/gestures/gesture_recognizer_impl.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/events/gestures/gesture_recognizer_impl.h"
 
 #include <limits>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 233 matching lines @@
   SetupTargets(*event, consumer);
 
   if (event->result() & ER_CONSUMED)
     return false;
 
   GestureProviderAura* gesture_provider =
       GetGestureProviderForConsumer(consumer);
   return gesture_provider->OnTouchEvent(event);
 }
 
+// TODO(tdresser): we should take a unique_event_id here, and validate
+// that the correct event is being acked. See crbug.com/457669 for
+// details.
 GestureRecognizer::Gestures*
 GestureRecognizerImpl::AckAsyncTouchEvent(
-    const TouchEvent& event,
     ui::EventResult result,
     GestureConsumer* consumer) {
   GestureProviderAura* gesture_provider =
       GetGestureProviderForConsumer(consumer);
   gesture_provider->OnAsyncTouchEventAck(result != ER_UNHANDLED);
   return gesture_provider->GetAndResetPendingGestures();
 }
 
 GestureRecognizer::Gestures* GestureRecognizerImpl::AckSyncTouchEvent(
     const uint64 unique_event_id,
@@ skipping 75 matching lines @@
   std::vector<GestureEventHelper*>::iterator it;
   for (it = helpers.begin(); it != helpers.end(); ++it)
     gesture_recognizer->AddGestureEventHelper(*it);
 
   helpers.clear();
   g_gesture_recognizer_instance =
       static_cast<GestureRecognizerImpl*>(gesture_recognizer);
 }
 
 }  // namespace ui