initial checkin of SkSL compiler

src/sksl/ast/SkSLASTDiscardStatement.h

+/*
+ * 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_ASTDISCARDSTATEMENT
+#define SKSL_ASTDISCARDSTATEMENT
+
+#include "SkSLASTStatement.h"
+
+namespace SkSL {
+
+/**
+ * A 'discard' statement. 
+ */
+struct ASTDiscardStatement : public ASTStatement {
+    ASTDiscardStatement(Position position)
+    : INHERITED(position, kDiscard_Kind) {}
+
+    std::string description() const override {
+        return std::string("discard;");

[dogben, 2016/06/20 16:23:18]

uber-nit: "std::string(" unnecessary.

+    }
+
+    typedef ASTStatement INHERITED;
+};
+
+} // namespace
+
+#endif