CrOS Alt+Tab UI: no-op when UI is aborted (instead of switching window).

ash/common/wm/window_cycle_controller.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 "ash/common/wm/window_cycle_controller.h"
 
 #include "ash/common/metrics/task_switch_source.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/wm/mru_window_tracker.h"
 #include "ash/common/wm/window_cycle_event_filter.h"
@@ skipping 60 matching lines @@
   active_window_before_window_cycle_ = GetActiveWindow(window_list);
 
   window_cycle_list_.reset(new WindowCycleList(window_list));
   event_filter_ = WmShell::Get()->CreateWindowCycleEventFilter();
   cycle_start_time_ = base::Time::Now();
   WmShell::Get()->RecordUserMetricsAction(UMA_WINDOW_CYCLE);
   UMA_HISTOGRAM_COUNTS_100("Ash.WindowCycleController.Items",
                            window_list.size());
 }
 
+void WindowCycleController::CompleteCycling() {
+  window_cycle_list_->set_user_did_accept(true);
+  StopCycling();
+}
+
+void WindowCycleController::CancelCycling() {
+  StopCycling();
+}
+
 //////////////////////////////////////////////////////////////////////////////
 // WindowCycleController, private:
 
 void WindowCycleController::Step(Direction direction) {
   DCHECK(window_cycle_list_.get());
   window_cycle_list_->Step(direction);
 }
 
 void WindowCycleController::StopCycling() {
   UMA_HISTOGRAM_COUNTS_100("Ash.WindowCycleController.SelectionDepth",
@@ skipping 10 matching lines @@
 
   if (active_window_after_window_cycle != nullptr &&
       active_window_before_window_cycle_ != active_window_after_window_cycle) {
     WmShell::Get()->RecordTaskSwitchMetric(
         TaskSwitchSource::WINDOW_CYCLE_CONTROLLER);
   }
   active_window_before_window_cycle_ = nullptr;
 }
 
 }  // namespace ash