cros: CustomFrameViewAsh avatar icon from a window prop

ash/frame/header_view.h

Index: ash/frame/header_view.h
diff --git a/ash/frame/header_view.h b/ash/frame/header_view.h
index 4d59fedcf2bedd81d285c218ae60b1056b38884b..584ef7c15af8ea3fb78abf3ebe5b8982a192fed6 100644
--- a/ash/frame/header_view.h
+++ b/ash/frame/header_view.h
@@ -15,6 +15,10 @@
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/views/view.h"
 
+namespace gfx {
+class ImageSkia;
+}
+
 namespace views {
 class ImageView;
 class Widget;
@@ -58,7 +62,8 @@ class ASH_EXPORT HeaderView : public views::View,
   // Returns the view's minimum width.
   int GetMinimumWidth() const;
 
-  void UpdateAvatarIcon();
+  // Sets the avatar icon to be displayed on the frame header.
+  void SetAvatarIcon(const gfx::ImageSkia& avatar);
 
   void SizeConstraintsChanged();