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

ash/common/frame/default_header_painter.cc

Index: ash/common/frame/default_header_painter.cc
diff --git a/ash/common/frame/default_header_painter.cc b/ash/common/frame/default_header_painter.cc
index 659e5cd53122f760ae7ca603e28773aad94581d5..e21030bdb9ec79a56a4f7aa89e75c01fb675cb2a 100644
--- a/ash/common/frame/default_header_painter.cc
+++ b/ash/common/frame/default_header_painter.cc
@@ -206,6 +206,14 @@ void DefaultHeaderPainter::SetFrameColors(SkColor active_frame_color,
   UpdateAllButtonImages();
 }
 
+SkColor DefaultHeaderPainter::GetActiveFrameColor() const {
+  return active_frame_color_;
+}
+
+SkColor DefaultHeaderPainter::GetInactiveFrameColor() const {
+  return inactive_frame_color_;
+}
+
 void DefaultHeaderPainter::UpdateLeftHeaderView(views::View* left_header_view) {
   left_header_view_ = left_header_view;
 }