Sticky keys modifies an entire scroll sequence instead of just a single event.

ui/events/x/events_x_utils.h

 // Copyright (c) 2013 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 "base/memory/scoped_ptr.h"
 #include "ui/events/event_constants.h"
 #include "ui/events/events_export.h"
 #include "ui/events/keycodes/keyboard_codes.h"
 #include "ui/events/x/device_data_manager.h"
 #include "ui/gfx/point.h"
@@ skipping 48 matching lines @@
 // the XEvent in a ScopedXI2Event, as XEvent is purely a struct and simply
 // deleting it will result in dangling pointers.
 EVENTS_EXPORT XEvent* CreateScrollEventForTest(
     int deviceid,
     int x_offset,
     int y_offset,
     int x_offset_ordinal,
     int y_offset_ordinal,
     int finger_count);
 
+// Creates the native XInput2 based XEvent for an aura scroll event of type
+// ET_SCROLL_FLING_START or ET_SCROLL_FLING_CANCEL. The caller is responsible
+// for the ownership of the returned XEvent.
+EVENTS_EXPORT XEvent* CreateFlingEventForTest(
+    int deviceid,
+    int x_velocity,
+    int y_velocity,
+    int x_velocity_ordinal,
+    int y_velocity_ordinal,
+    bool is_cancel);
+
 // Initializes a test touchpad device for scroll events.
 EVENTS_EXPORT void SetUpScrollDeviceForTest(unsigned int deviceid);
 
 #if defined(USE_XI2_MT)
 
 EVENTS_EXPORT XEvent* CreateTouchEventForTest(
     int deviceid,
     int evtype,
     int tracking_id,
     const gfx::Point& location,
     const std::vector<Valuator>& valuators);
 
 EVENTS_EXPORT void SetupTouchDevicesForTest(
     const std::vector<unsigned int>& devices);
 
 #endif
 
 }  // namespace ui