initial checkin of SkSL compiler

src/sksl/ast/SkSLASTExpressionStatement.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_ASTEXPRESSIONSTATEMENT
+#define SKSL_ASTEXPRESSIONSTATEMENT
+
+#include "SkSLASTStatement.h"
+
+namespace SkSL {
+
+/**
+ * A lone expression being used as a statement. 
+ */
+struct ASTExpressionStatement : public ASTStatement {
+    ASTExpressionStatement(std::unique_ptr<ASTExpression> expression)
+    : INHERITED(expression->fPosition, kExpression_Kind)
+    , fExpression(std::move(expression)) {}
+
+    std::string description() const override {
+        return fExpression->description() + ";";
+    }
+
+    const std::unique_ptr<ASTExpression> fExpression;
+
+    typedef ASTStatement INHERITED;
+};
+
+} // namespace
+
+#endif