Fold gmtoskp into DM, as --src gm --config skp.

gyp/experimental.gyp

Index: gyp/experimental.gyp
diff --git a/gyp/experimental.gyp b/gyp/experimental.gyp
index 6405e81576d0a13dfab9bca0a38672a49ca961f0..ffc1753e68273498ea0b528949de7bf6a24e2917 100644
--- a/gyp/experimental.gyp
+++ b/gyp/experimental.gyp
@@ -105,27 +105,5 @@
         'tools.gyp:sk_tool_utils',
       ],
     },
-    {
-      'target_name': 'gmtoskp',
-      'type': 'executable',
-      'sources': [
-        '../experimental/tools/gmtoskp.cpp',
-        '../gm/gm.cpp',
-      ],
-      'include_dirs': [
-        '../tools',
-        '../src/effects',
-        '../src/core',
-        '../src/gpu',
-        '../third_party/etc1',
-      ],
-      'dependencies': [
-        'skia_lib.gyp:skia_lib',
-        'tools.gyp:resources',
-        'tools.gyp:sk_tool_utils',
-        'gputest.gyp:skgputest',
-      ],
-      'includes': [ 'gmslides.gypi', ],
-    },
   ],
 }