MacViews: Reveal scrollbars when resting on the trackpad.

ui/events/test/event_generator.h

 // 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.
 
 #ifndef UI_EVENTS_TEST_EVENT_GENERATOR_H_
 #define UI_EVENTS_TEST_EVENT_GENERATOR_H_
 
 #include <list>
 #include <memory>
 #include <vector>
@@ skipping 332 matching lines @@
                       int steps,
                       int num_fingers);
 
   // Generates scroll sequences of a FlingCancel, Scrolls, FlingStart, sending
   // scrolls of each of the values in |offsets|.
   void ScrollSequence(const gfx::Point& start,
                       const base::TimeDelta& step_delay,
                       const std::vector<gfx::PointF>& offsets,
                       int num_fingers);
 
+  // Generate a TrackPad "rest" event. That is, a user resting fingers on the
+  // trackpad without moving. This may then be followed by a ScrollSequence(),
+  // or a CancelTrackpadRest().
+  void GenerateTrackpadRest();
+
+  // Cancels a previous GenerateTrackpadRest(). That is, a user lifting fingers
+  // from the trackpad without having moved them in any direction.
+  void CancelTrackpadRest();
+
   // Generates a key press event. On platforms except Windows and X11, a key
   // event without native_event() is generated. Note that ui::EF_ flags should
   // be passed as |flags|, not the native ones like 'ShiftMask' in <X11/X.h>.
   // TODO(yusukes): Support native_event() on all platforms.
   void PressKey(KeyboardCode key_code, int flags);
 
   // Generates a key release event. On platforms except Windows and X11, a key
   // event without native_event() is generated. Note that ui::EF_ flags should
   // be passed as |flags|, not the native ones like 'ShiftMask' in <X11/X.h>.
   // TODO(yusukes): Support native_event() on all platforms.
@@ skipping 41 matching lines @@
   bool targeting_application_;
   std::unique_ptr<base::TickClock> tick_clock_;
 
   DISALLOW_COPY_AND_ASSIGN(EventGenerator);
 };
 
 }  // namespace test
 }  // namespace ui
 
 #endif  // UI_EVENTS_TEST_EVENT_GENERATOR_H_