initial checkin of SkSL compiler

gyp/sksl.gyp

Index: gyp/sksl.gyp
diff --git a/gyp/sksl.gyp b/gyp/sksl.gyp
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+# Copyright (c) 2012 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+{
+  'targets': [
+    {
+      'target_name': 'sksl',
+      'type': 'static_library',
+      'standalone_static_library': 1,
+      'include_dirs': [
+        '../include',
+        '../include/config',
+        '../include/core',
+        '../include/private',
+        '../src/sksl',
+      ],
+      'sources': [
+        '../src/sksl/SkSLCompiler.cpp',
+        '../src/sksl/SkSLIRGenerator.cpp',
+        '../src/sksl/SkSLParser.cpp',
+        '../src/sksl/SkSLSPIRVCodeGenerator.cpp',
+        '../src/sksl/SkSLUtil.cpp',
+        '../src/sksl/ir/SkSLSymbolTable.cpp',
+        '../src/sksl/ir/SkSLType.cpp',
+      ],
+    },
+  ],
+}