Animating docked background in sync with shelf

ash/shelf/background_animator.cc

Index: ash/shelf/background_animator.cc
diff --git a/ash/shelf/background_animator.cc b/ash/shelf/background_animator.cc
index 35e5fba3a74e8699fd5e072efb6419c0269ef09f..f1bcf0e25f28b1984d242156499ce07977db2e8a 100644
--- a/ash/shelf/background_animator.cc
+++ b/ash/shelf/background_animator.cc
@@ -34,7 +34,8 @@ void BackgroundAnimator::SetDuration(int time_in_ms) {
   animation_.SetSlideDuration(time_in_ms);
 }
 
-void BackgroundAnimator::SetPaintsBackground(bool value, ChangeType type) {
+void BackgroundAnimator::SetPaintsBackground(
+    bool value, BackgroundAnimatorChangeType type) {
   if (paints_background_ == value)
     return;
   paints_background_ = value;