initial checkin of SkSL compiler

src/sksl/ir/SkSLBoolLiteral.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_BOOLLITERAL
+#define SKSL_BOOLLITERAL
+
+#include "SkSLExpression.h"
+
+namespace SkSL {
+
+/**
+ * Represents 'true' or 'false'.
+ */
+struct BoolLiteral : public Expression {
+    BoolLiteral(Position position, bool value)
+    : INHERITED(position, kBoolLiteral_Kind, kBool_Type)
+    , fValue(value) {}
+
+    std::string description() const override {
+        return fValue ? "true" : "false";
+    }
+
+    bool isConstant() const override {
+        return true;
+    }
+
+    const bool fValue;
+
+    typedef Expression INHERITED;
+};
+
+} // namespace
+
+#endif