Clear pending events upon main frame navigation

ui/events/gesture_detection/gesture_provider.cc

 // Copyright 2014 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/gesture_detection/gesture_provider.h"
 
 #include <cmath>
 
 #include "base/auto_reset.h"
 #include "base/debug/trace_event.h"
 #include "ui/events/event_constants.h"
 #include "ui/events/gesture_detection/gesture_event_data.h"
 #include "ui/events/gesture_detection/gesture_listeners.h"
-#include "ui/events/gesture_detection/motion_event.h"
+#include "ui/events/gesture_detection/motion_event_generic.h"
 #include "ui/events/gesture_detection/scale_gesture_listeners.h"
 #include "ui/gfx/geometry/point_f.h"
 
 namespace ui {
 namespace {
 
 // Double-tap drag zoom sensitivity (speed).
 const float kDoubleTapDragZoomSpeed = 0.005f;
 
 const char* GetMotionEventActionName(MotionEvent::Action action) {
@@ skipping 679 matching lines @@
   if (!CanHandle(event))
     return false;
 
   OnTouchEventHandlingBegin(event);
   gesture_listener_->OnTouchEvent(event);
   OnTouchEventHandlingEnd(event);
   uma_histogram_.RecordTouchEvent(event);
   return true;
 }
 
+void GestureProvider::ResetDetection() {
+  ui::MotionEventGeneric synthetic_cancel(ui::MotionEvent::ACTION_CANCEL,
+                                          base::TimeTicks::Now(),
+                                          ui::PointerProperties());
+  OnTouchEvent(synthetic_cancel);
+  DCHECK(!current_down_event_);
+}
+
 void GestureProvider::SetMultiTouchZoomSupportEnabled(bool enabled) {
   gesture_listener_->SetMultiTouchZoomEnabled(enabled);
 }
 
 void GestureProvider::SetDoubleTapSupportForPlatformEnabled(bool enabled) {
   if (double_tap_support_for_platform_ == enabled)
     return;
   double_tap_support_for_platform_ = enabled;
   UpdateDoubleTapDetectionSupport();
 }
@@ skipping 89 matching lines @@
   // null'ing of the listener until the sequence has ended.
   if (current_down_event_)
     return;
 
   const bool double_tap_enabled =
       double_tap_support_for_page_ && double_tap_support_for_platform_;
   gesture_listener_->SetDoubleTapEnabled(double_tap_enabled);
 }
 
 }  //  namespace ui