Fix black background when locking with fullscreen window:

ui/base/animation/animation_container.cc

Index: ui/base/animation/animation_container.cc
diff --git a/ui/base/animation/animation_container.cc b/ui/base/animation/animation_container.cc
index c82d26b9aa5048ea9cdd69b7b7a389dfdb08eebe..f404b7bfbf25e221a27c774d961350787feb5dbc 100644
--- a/ui/base/animation/animation_container.cc
+++ b/ui/base/animation/animation_container.cc
@@ -14,7 +14,8 @@ namespace ui {
 
 AnimationContainer::AnimationContainer()
     : last_tick_time_(TimeTicks::Now()),
-      observer_(NULL) {
+      observer_(NULL),
+      test_timing_enabled_(false) {
 }
 
 AnimationContainer::~AnimationContainer() {
@@ -28,7 +29,7 @@ void AnimationContainer::Start(AnimationContainerElement* element) {
                                           // element isn't running.
 
   if (elements_.empty()) {
-    last_tick_time_ = TimeTicks::Now();
+    last_tick_time_ = GetCurrentTime();
     SetMinTimerInterval(element->GetTimerInterval());
   } else if (element->GetTimerInterval() < min_timer_interval_) {
     SetMinTimerInterval(element->GetTimerInterval());
@@ -61,7 +62,7 @@ void AnimationContainer::Run() {
   // ourself here to make sure we're still valid after running all the elements.
   scoped_refptr<AnimationContainer> this_ref(this);
 
-  TimeTicks current_time = TimeTicks::Now();
+  TimeTicks current_time = GetCurrentTime();
 
   last_tick_time_ = current_time;
 
@@ -101,4 +102,10 @@ TimeDelta AnimationContainer::GetMinInterval() {
   return min;
 }
 
+TimeTicks AnimationContainer::GetCurrentTime() {
+  if (test_timing_enabled_)
+    return test_time_;
+  return TimeTicks::Now();
+}
+
 }  // namespace ui