initial checkin of SkSL compiler

src/sksl/ir/SkSLFloatLiteral.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_FLOATLITERAL
+#define SKSL_FLOATLITERAL
+
+#include "SkSLExpression.h"
+
+namespace SkSL {
+
+/**
+ * A literal floating point number.
+ */
+struct FloatLiteral : public Expression {
+    FloatLiteral(Position position, double value)
+    : INHERITED(position, kFloatLiteral_Kind, kFloat_Type)
+    , fValue(value) {}
+
+    virtual std::string description() const override {
+        return to_string(fValue);
+    }
+
+    bool isConstant() const override {
+        return true;
+    }
+
+    const double fValue;
+
+    typedef Expression INHERITED;
+};
+
+} // namespace
+
+#endif