Add brightness/grayscale animations and use them for OOBE boot transition

ui/compositor/test/test_layer_animation_delegate.cc

Index: ui/compositor/test/test_layer_animation_delegate.cc
diff --git a/ui/compositor/test/test_layer_animation_delegate.cc b/ui/compositor/test/test_layer_animation_delegate.cc
index b4cd481273674a7820f8bf2e3788f2b243139847..74275715dab4ade0e9b33f58c5857bad835aefca 100644
--- a/ui/compositor/test/test_layer_animation_delegate.cc
+++ b/ui/compositor/test/test_layer_animation_delegate.cc
@@ -40,6 +40,14 @@ void TestLayerAnimationDelegate::SetVisibilityFromAnimation(bool visibility) {
   visibility_ = visibility;
 }
 
+void TestLayerAnimationDelegate::SetBrightnessFromAnimation(float brightness) {
+  brightness_ = brightness;
+}
+
+void TestLayerAnimationDelegate::SetGrayscaleFromAnimation(float grayscale) {
+  grayscale_ = grayscale;
+}
+
 void TestLayerAnimationDelegate::ScheduleDrawForAnimation() {
 }
 
@@ -59,4 +67,12 @@ bool TestLayerAnimationDelegate::GetVisibilityForAnimation() const {
   return visibility_;
 }
 
+float TestLayerAnimationDelegate::GetBrightnessForAnimation() const {
+  return brightness_;
+}
+
+float TestLayerAnimationDelegate::GetGrayscaleForAnimation() const {
+  return grayscale_;
+}
+
 }  // namespace ui