MacViews: Reveal scrollbars when resting on the trackpad.

ui/events/test/event_generator.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/test/event_generator.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
@@ skipping 532 matching lines @@
   ui::ScrollEvent fling_start(ui::ET_SCROLL_FLING_START,
                               start,
                               timestamp,
                               0,
                               offsets[steps - 1].x(), offsets[steps - 1].y(),
                               offsets[steps - 1].x(), offsets[steps - 1].y(),
                               num_fingers);
   Dispatch(&fling_start);
 }
 
+void EventGenerator::GenerateTrackpadRest() {
+  int num_fingers = 2;
+  ui::ScrollEvent scroll(ui::ET_SCROLL, current_location_,
+                         ui::EventTimeForNow(), 0, 0, 0, 0, 0, num_fingers,
+                         EventMomentumPhase::MAY_BEGIN);
+  Dispatch(&scroll);
+}
+
+void EventGenerator::CancelTrackpadRest() {
+  int num_fingers = 2;
+  ui::ScrollEvent scroll(ui::ET_SCROLL, current_location_,
+                         ui::EventTimeForNow(), 0, 0, 0, 0, 0, num_fingers,
+                         EventMomentumPhase::END);
+  Dispatch(&scroll);
+}
+
 void EventGenerator::PressKey(ui::KeyboardCode key_code, int flags) {
   DispatchKeyEvent(true, key_code, flags);
 }
 
 void EventGenerator::ReleaseKey(ui::KeyboardCode key_code, int flags) {
   DispatchKeyEvent(false, key_code, flags);
 }
 
 void EventGenerator::Dispatch(ui::Event* event) {
   DoDispatchEvent(event, async_);
@@ skipping 128 matching lines @@
   return default_delegate;
 }
 
 EventGeneratorDelegate* EventGenerator::delegate() {
   return const_cast<EventGeneratorDelegate*>(
       const_cast<const EventGenerator*>(this)->delegate());
 }
 
 }  // namespace test
 }  // namespace ui