Allows observers to be notified when layer animations complete.

ui/gfx/compositor/layer_animation_sequence.cc

 // Copyright (c) 2011 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/gfx/compositor/layer_animation_sequence.h"
 
 #include <algorithm>
 #include <iterator>
 
 #include "base/debug/trace_event.h"
 #include "ui/gfx/compositor/layer_animation_delegate.h"
 #include "ui/gfx/compositor/layer_animation_element.h"
+#include "ui/gfx/compositor/layer_animation_observer.h"
 
 namespace ui {
 
 LayerAnimationSequence::LayerAnimationSequence()
     : is_cyclic_(false),
       last_element_(0) {
 }
 
 LayerAnimationSequence::LayerAnimationSequence(LayerAnimationElement* element)
     : is_cyclic_(false),
@@ skipping 76 matching lines @@
     const LayerAnimationElement::AnimatableProperties& other) const {
   LayerAnimationElement::AnimatableProperties intersection;
   std::insert_iterator<LayerAnimationElement::AnimatableProperties> ii(
       intersection, intersection.begin());
   std::set_intersection(properties_.begin(), properties_.end(),
                         other.begin(), other.end(),
                         ii);
   return intersection.size() > 0;
 }
 
+void LayerAnimationSequence::AddObserver(LayerAnimationObserver* observer) {
+  if (!observers_.HasObserver(observer))
+    observers_.AddObserver(observer);
+}
+
+void LayerAnimationSequence::RemoveObserver(LayerAnimationObserver* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+void LayerAnimationSequence::NotifyEnded() {
+  FOR_EACH_OBSERVER(LayerAnimationObserver,
+                    observers_,
+                    OnLayerAnimationEnded(this));
+}
+
 }  // namespace ui