initial checkin of SkSL compiler

src/sksl/ir/SkSLExpressionStatement.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_EXPRESSIONSTATEMENT
+#define SKSL_EXPRESSIONSTATEMENT
+
+#include "SkSLExpression.h"
+#include "SkSLStatement.h"
+
+namespace SkSL {
+
+/**
+ * A lone expression being used as a statement. 
+ */
+struct ExpressionStatement : public Statement {
+    ExpressionStatement(std::unique_ptr<Expression> expression)
+    : INHERITED(expression->fPosition, kExpression_Kind)
+    , fExpression(std::move(expression)) {}
+
+    std::string description() const override {
+        return fExpression->description() + ";";
+    }
+
+    const std::unique_ptr<Expression> fExpression;
+
+    typedef Statement INHERITED;
+};
+
+} // namespace
+
+#endif