Add GestureTapCancel gesture type

content/browser/renderer_host/gesture_event_filter.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 "content/browser/renderer_host/gesture_event_filter.h"
 
 #include "base/command_line.h"
 #include "base/string_number_conversions.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/browser/renderer_host/tap_suppression_controller.h"
@@ skipping 124 matching lines @@
 }
 
 void GestureEventFilter::Reset() {
   fling_in_progress_ = false;
   coalesced_gesture_events_.clear();
   deferred_tap_down_event_.type = WebInputEvent::Undefined;
   // TODO(rjkroege): Reset the tap suppression controller.
 }
 
 void GestureEventFilter::ProcessGestureAck(bool processed, int type) {
+  DCHECK_EQ(coalesced_gesture_events_.front().type, type);
   coalesced_gesture_events_.pop_front();
   if (!coalesced_gesture_events_.empty()) {
     WebGestureEvent next_gesture_event = coalesced_gesture_events_.front();
     render_widget_host_->ForwardGestureEventImmediately(next_gesture_event);
   }
 }
 
 TapSuppressionController*  GestureEventFilter::GetTapSuppressionController() {
   return tap_suppression_controller_.get();
 }
@@ skipping 34 matching lines @@
             last_gesture_event->timeStampSeconds)
             << "Event time not monotonic?\n";
     DCHECK(last_gesture_event->type == WebInputEvent::GestureScrollUpdate);
     last_gesture_event->timeStampSeconds = gesture_event.timeStampSeconds;
   } else {
     coalesced_gesture_events_.push_back(gesture_event);
   }
 }
 
 } // namespace content