initial checkin of SkSL compiler

src/sksl/ast/SkSLASTPositionNode.h

Index: src/sksl/ast/SkSLASTPositionNode.h
diff --git a/src/sksl/ast/SkSLASTPositionNode.h b/src/sksl/ast/SkSLASTPositionNode.h
new file mode 100644
index 0000000000000000000000000000000000000000..226b4ae4b06ea602fd96f5b3e6e169e8f746bdcb
--- /dev/null
+++ b/src/sksl/ast/SkSLASTPositionNode.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+ 
+#ifndef SKSL_ASTPOSITIONNODE
+#define SKSL_ASTPOSITIONNODE
+
+#include "SkSLASTNode.h"
+#include "../SkSLPosition.h"
+
+namespace SkSL {
+
+/**
+ * An AST node with an associated position in the source.
+ */
+struct ASTPositionNode : public ASTNode {
+    ASTPositionNode(Position position)
+    : fPosition(position) {}
+
+    const Position fPosition;
+};
+
+} // namespace
+
+#endif