initial checkin of SkSL compiler

src/sksl/ast/SkSLASTDoStatement.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_ASTDOSTATEMENT
+#define SKSL_ASTDOSTATEMENT
+
+#include "SkSLASTStatement.h"
+
+namespace SkSL {
+
+/**
+ * A 'do' loop. 
+ */
+struct ASTDoStatement : public ASTStatement {
+    ASTDoStatement(Position position, std::unique_ptr<ASTExpression> test, 

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

nit: should test and statement be in the opposite order? (Same for fields
below.)

+                   std::unique_ptr<ASTStatement> statement)
+    : INHERITED(position, kDo_Kind)
+    , fTest(std::move(test))
+    , fStatement(std::move(statement)) {}
+
+    std::string description() const override {
+        return "do " + fStatement->description() + " while (" + fTest->description() + ");";
+    }
+
+    const std::unique_ptr<ASTExpression> fTest;
+    const std::unique_ptr<ASTStatement> fStatement;
+
+    typedef ASTStatement INHERITED;
+};
+
+} // namespace
+
+#endif