Replace agg with skia

core/src/fxge/agg/agg23/agg_color_gray.h

Index: core/src/fxge/agg/agg23/agg_color_gray.h
diff --git a/core/src/fxge/agg/agg23/agg_color_gray.h b/core/src/fxge/agg/agg23/agg_color_gray.h
deleted file mode 100644
index 5db7bcaf28fa4d6d51705a190c254bfce429ab9f..0000000000000000000000000000000000000000
--- a/core/src/fxge/agg/agg23/agg_color_gray.h
+++ /dev/null
@@ -1,50 +0,0 @@
-
-//----------------------------------------------------------------------------
-// Anti-Grain Geometry - Version 2.3
-// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
-//
-// Permission to copy, use, modify, sell and distribute this software
-// is granted provided this copyright notice appears in all copies.
-// This software is provided "as is" without express or implied
-// warranty, and with no claim as to its suitability for any purpose.
-//
-//----------------------------------------------------------------------------
-// Contact: mcseem@antigrain.com
-//          mcseemagg@yahoo.com
-//          http://www.antigrain.com
-//----------------------------------------------------------------------------
-//
-// Adaptation for high precision colors has been sponsored by
-// Liberty Technology Systems, Inc., visit http://lib-sys.com
-//
-// Liberty Technology Systems, Inc. is the provider of
-// PostScript and PDF technology for software developers.
-//
-//----------------------------------------------------------------------------
-//
-// color types gray8, gray16
-//
-//----------------------------------------------------------------------------
-#ifndef AGG_COLOR_GRAY_INCLUDED
-#define AGG_COLOR_GRAY_INCLUDED
-#include "agg_basics.h"
-namespace agg
-{
-struct gray8 {
-    typedef int8u  value_type;
-    typedef int32u calc_type;
-    typedef int32  long_type;
-    enum base_scale_e {
-        base_shift = 8,
-        base_size  = 1 << base_shift,
-        base_mask  = base_size - 1
-    };
-    typedef gray8 self_type;
-    value_type v;
-    value_type a;
-    gray8() {}
-    gray8(unsigned v_, unsigned a_ = base_mask) :
-        v(int8u(v_)), a(int8u(a_)) {}
-};
-}
-#endif