compositor/layer_animator: handle delegate removal in LayerAnimation::StopAnimating

ui/wm/core/window_animations_unittest.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 "ui/wm/core/window_animations.h"
 
 #include "base/time/time.h"
 #include "ui/aura/test/aura_test_base.h"
 #include "ui/aura/test/test_windows.h"
 #include "ui/aura/window.h"
@@ skipping 282 matching lines @@
   ui::Layer* animating_layer = window->layer();
   wm::SetWindowVisibilityAnimationType(window.get(),
                                        WINDOW_VISIBILITY_ANIMATION_TYPE_ROTATE);
 
   AnimateOnChildWindowVisibilityChanged(window.get(), true);
   AnimateOnChildWindowVisibilityChanged(window.get(), false);
 
   animating_layer->GetAnimator()->StopAnimating();
 }
 
+// The rotation animation for hiding a window should not crash when terminated
+// by LayerAnimator::StopAnimating().
+TEST_F(WindowAnimationsTest, RotateHideNoCrash) {
+  ui::ScopedAnimationDurationScaleMode scale_mode(
+      ui::ScopedAnimationDurationScaleMode::FAST_DURATION);
+
+  scoped_ptr<aura::Window> window(aura::test::CreateTestWindowWithId(0, NULL));
+  ui::Layer* animating_layer = window->layer();
+  wm::SetWindowVisibilityAnimationType(window.get(),
+                                       WINDOW_VISIBILITY_ANIMATION_TYPE_ROTATE);
+  AnimateOnChildWindowVisibilityChanged(window.get(), true);
+  window->layer()->GetAnimator()->Step(base::TimeTicks::Now() +
+                                       base::TimeDelta::FromSeconds(5));
+  AnimateOnChildWindowVisibilityChanged(window.get(), false);
+  animating_layer->GetAnimator()->StopAnimating();
+}
+
 }  // namespace wm