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

ui/aura/client/aura_constants.cc

Index: ui/aura/client/aura_constants.cc
diff --git a/ui/aura/client/aura_constants.cc b/ui/aura/client/aura_constants.cc
index 3ff4ee90e063d18631c2c44936c15f83e5b8faad..2142997bd174b8318acd53314563f643aba7e005 100644
--- a/ui/aura/client/aura_constants.cc
+++ b/ui/aura/client/aura_constants.cc
@@ -15,6 +15,7 @@ DECLARE_EXPORTED_WINDOW_PROPERTY_TYPE(AURA_EXPORT, ui::InputMethod*)
 DECLARE_EXPORTED_WINDOW_PROPERTY_TYPE(AURA_EXPORT, ui::WindowShowState)
 DECLARE_EXPORTED_WINDOW_PROPERTY_TYPE(AURA_EXPORT, int)
 DECLARE_EXPORTED_WINDOW_PROPERTY_TYPE(AURA_EXPORT, void*)
+DECLARE_EXPORTED_WINDOW_PROPERTY_TYPE(AURA_EXPORT, SkColor)
 
 namespace aura {
 namespace client {
@@ -40,6 +41,7 @@ DEFINE_WINDOW_PROPERTY_KEY(
 DEFINE_WINDOW_PROPERTY_KEY(
     ui::WindowShowState, kShowStateKey, ui::SHOW_STATE_DEFAULT);
 DEFINE_WINDOW_PROPERTY_KEY(int, kTopViewInset, 0);
+DEFINE_WINDOW_PROPERTY_KEY(SkColor, kTopViewColor, SK_ColorTRANSPARENT);
 DEFINE_OWNED_WINDOW_PROPERTY_KEY(gfx::ImageSkia, kWindowIconKey, nullptr);
 
 }  // namespace client