exo: Replace fling cancel with generic zero distance scroll

components/exo/pointer.h

 // Copyright 2015 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 COMPONENTS_EXO_POINTER_H_
 #define COMPONENTS_EXO_POINTER_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "components/exo/surface_delegate.h"
 #include "components/exo/surface_observer.h"
 #include "components/exo/wm_helper.h"
+#include "ui/events/event_constants.h"
 #include "ui/events/event_handler.h"
 #include "ui/gfx/geometry/point.h"
 #include "ui/gfx/geometry/point_f.h"
 
 namespace ui {
 class Event;
 class MouseEvent;
 class MouseWheelEvent;
 }
 
@@ skipping 79 matching lines @@
 
   // The current pointer tilt.
   gfx::Vector2dF tilt_;
 
   // The current pointer force.
   float force_;
 
   // True if the pointer is controlled via direct input.
   bool is_direct_input_ = false;
 
+  // Last received event type.
+  ui::EventType last_event_type_ = ui::ET_UNKNOWN;
+
   DISALLOW_COPY_AND_ASSIGN(Pointer);
 };
 
 }  // namespace exo
 
 #endif  // COMPONENTS_EXO_POINTER_H_