initial checkin of SkSL compiler

gyp/skslc.gyp

Index: gyp/skslc.gyp
diff --git a/gyp/skslc.gyp b/gyp/skslc.gyp
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+# Copyright 2016 Google Inc.
+#
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+{
+  'includes': [
+    'apptype_console.gypi',
+  ],
+  'targets': [
+    {
+      'target_name': 'skslc',
+      'type': 'executable',
+      'includes' : [
+        'sksl.gypi',
+      ],
+      'sources': [
+        '../src/sksl/SkSLMain.cpp',
+      ],
+      'configurations': {
+        'Debug': {
+          'defines': [
+            'DEBUG',
+          ],
+        },
+      },
+    },
+  ],
+}