Switch ending workspace cycling to when the user lifts their fingers off the track pad

ash/wm/workspace/workspace_cycler.cc

 // Copyright (c) 2012 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/wm/workspace/workspace_cycler.h"
 
 #include <cmath>
 
 #include "ash/shell.h"
 #include "ash/wm/workspace/workspace_manager.h"
@@ skipping 84 matching lines @@
 }
 
 void WorkspaceCycler::OnEvent(ui::Event* event) {
   if (!IsCyclingAllowed())
     SetState(NOT_CYCLING);
 
   ui::EventHandler::OnEvent(event);
 }
 
 void WorkspaceCycler::OnScrollEvent(ui::ScrollEvent* event) {
-  // End cycling when the user taps after having cycled through workspaces.
-  // TODO(pkotwicz): Use ui::ET_SCROLL_FLING_START instead to end cycling once
-  // it works for three fingers. (http://crbug.com/170484)
-  if (state_ != NOT_CYCLING && event->type() == ui::ET_SCROLL_FLING_CANCEL) {
+  if (state_ != NOT_CYCLING && event->type() == ui::ET_SCROLL_FLING_START) {
     SetState(STOPPING_CYCLING);
     event->StopPropagation();
     return;
   }
 
   if (event->finger_count() != 3 ||
       event->type() != ui::ET_SCROLL) {
     if (state_ != NOT_CYCLING)
       event->StopPropagation();
     return;
@@ skipping 47 matching lines @@
   animator_.reset();
   SetState(NOT_CYCLING);
 
   // Activate the workspace after updating the state so that a call to
   // AbortCycling() as a result of SetActiveWorkspaceFromCycler() is a noop.
   workspace_manager_->SetActiveWorkspaceFromCycler(workspace_to_activate);
 }
 
 }  // namespace internal
 }  // namespace ash