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 "base/memory/weak_ptr.h"
 #include "base/unguessable_token.h"
 #include "components/exo/surface_delegate.h"
 #include "components/exo/surface_observer.h"
 #include "components/exo/wm_helper.h"
 #include "ui/base/cursor/cursor.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"
 #include "ui/gfx/native_widget_types.h"
 
 namespace cc {
 class CopyOutputResult;
 }
 
 namespace ui {
@@ skipping 73 matching lines @@
 
   // The position of the pointer surface relative to the pointer location.
   gfx::Point hotspot_;
 
   // The current cursor.
   ui::Cursor cursor_;
 
   // Source used for cursor capture copy output requests.
   const base::UnguessableToken cursor_capture_source_id_;
 
+  // Last received event type.
+  ui::EventType last_event_type_ = ui::ET_UNKNOWN;
+
   // Weak pointer factory used for cursor capture callbacks.
   base::WeakPtrFactory<Pointer> cursor_capture_weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Pointer);
 };
 
 }  // namespace exo
 
 #endif  // COMPONENTS_EXO_POINTER_H_