Reland of [ash-md] Fades overview header in and out

ash/aura/wm_window_aura.cc

Index: ash/aura/wm_window_aura.cc
diff --git a/ash/aura/wm_window_aura.cc b/ash/aura/wm_window_aura.cc
index e4c6b75a7a16d072a3542d81c1f9c50559a9a3db..6351b2fe7375e6a29e38f400254aff3868941f35 100644
--- a/ash/aura/wm_window_aura.cc
+++ b/ash/aura/wm_window_aura.cc
@@ -253,6 +253,10 @@ float WmWindowAura::GetTargetOpacity() const {
   return window_->layer()->GetTargetOpacity();
 }
 
+gfx::Rect WmWindowAura::GetMinimizeAnimationTargetBoundsInScreen() const {
+  return ash::GetMinimizeAnimationTargetBoundsInScreen(window_);
+}
+
 void WmWindowAura::SetTransform(const gfx::Transform& transform) {
   window_->SetTransform(transform);
 }
@@ -284,6 +288,23 @@ bool WmWindowAura::GetBoolProperty(WmWindowProperty key) {
   return false;
 }
 
+SkColor WmWindowAura::GetColorProperty(WmWindowProperty key) {
+  if (key == WmWindowProperty::TOP_VIEW_COLOR)
+    return window_->GetProperty(aura::client::kTopViewColor);
+
+  NOTREACHED();
+  return 0;
+}
+
+void WmWindowAura::SetColorProperty(WmWindowProperty key, SkColor value) {
+  if (key == WmWindowProperty::TOP_VIEW_COLOR) {
+    window_->SetProperty(aura::client::kTopViewColor, value);
+    return;
+  }
+
+  NOTREACHED();
+}
+
 int WmWindowAura::GetIntProperty(WmWindowProperty key) {
   if (key == WmWindowProperty::SHELF_ID)
     return GetShelfIDForWindow(window_);