Fix black background when locking with fullscreen window:

ui/compositor/layer_animation_observer.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/compositor/layer_animation_observer.h"
 
 #include "ui/compositor/layer_animation_sequence.h"
 
 namespace ui {
 
@@ skipping 102 matching lines @@
   CheckCompleted();
 }
 
 void ImplicitAnimationObserver::CheckCompleted() {
   if (active_ && attached_sequences().empty()) {
     active_ = false;
     OnImplicitAnimationsCompleted();
   }
 }
 
+////////////////////////////////////////////////////////////////////////////////
+// AnimationFinishedObserver
+
+AnimationFinishedObserver::AnimationFinishedObserver(
+    base::Callback<void(void)> &callback)
+    : callback_(callback),
+      sequences_attached_(0),
+      sequences_completed_(0),
+      paused_(false) {
+}
+
+AnimationFinishedObserver::~AnimationFinishedObserver() {
+}
+
+void AnimationFinishedObserver::Pause() {
+  paused_ = true;
+}
+
+void AnimationFinishedObserver::Unpause() {
+  if (!paused_)
+    return;
+  paused_ = false;
+  if (sequences_completed_ == sequences_attached_) {
+    callback_.Run();
+    delete this;
+  }
+}
+
+void AnimationFinishedObserver::OnLayerAnimationEnded(
+    ui::LayerAnimationSequence* seq) {
+  sequences_completed_++;
+  if ((sequences_completed_ == sequences_attached_) && !paused_) {
+    callback_.Run();
+    delete this;
+  }
+}
+
+void AnimationFinishedObserver::OnLayerAnimationAborted(
+    ui::LayerAnimationSequence* seq) {
+  sequences_completed_++;
+  if ((sequences_completed_ == sequences_attached_) && !paused_)
+    delete this;
+}
+
+void AnimationFinishedObserver::OnAttachedToSequence(
+    LayerAnimationSequence* sequence) {
+  LayerAnimationObserver::OnAttachedToSequence(sequence);
+  sequences_attached_++;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// AnimationAbortedObserver
+
+AnimationAbortedObserver::AnimationAbortedObserver(
+    base::Callback<void(void)> &callback)
+    : callback_(callback),
+      sequences_attached_(0),
+      sequences_completed_(0),
+      aborted_(false) {
+}
+
+AnimationAbortedObserver::~AnimationAbortedObserver() {
+  if (sequences_completed_ != sequences_attached_) {
+    if (aborted_)
+      callback_.Run();
+  }
+}
+
+void AnimationAbortedObserver::Pause() {
+  paused_ = true;
+}
+
+void AnimationAbortedObserver::Unpause() {
+  if (!paused_)
+    return;
+  paused_ = false;
+  if (sequences_completed_ == sequences_attached_) {
+    if (aborted_)
+      callback_.Run();
+    delete this;
+  }
+}
+
+void AnimationAbortedObserver::OnLayerAnimationEnded(
+    ui::LayerAnimationSequence* seq) {
+  sequences_completed_++;
+  if ((sequences_completed_ == sequences_attached_) && !paused_) {
+    if (aborted_)
+      callback_.Run();
+    delete this;
+  }
+}
+
+void AnimationAbortedObserver::OnLayerAnimationAborted(
+    ui::LayerAnimationSequence* seq) {
+  aborted_ = true;
+  sequences_completed_++;
+  if ((sequences_completed_ == sequences_attached_) && !paused_) {
+    callback_.Run();
+    delete this;
+  }
+}
+
+void AnimationAbortedObserver::OnAttachedToSequence(
+    LayerAnimationSequence* sequence) {
+  LayerAnimationObserver::OnAttachedToSequence(sequence);
+  sequences_attached_++;
+}
+
 }  // namespace ui