initial checkin of SkSL compiler

src/sksl/ast/SkSLASTFloatLiteral.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_ASTFLOATLITERAL
+#define SKSL_ASTFLOATLITERAL
+
+#include "SkSLASTExpression.h"
+
+namespace SkSL {
+
+/**
+ * A literal floating point number. 
+ */
+struct ASTFloatLiteral : public ASTExpression {
+    ASTFloatLiteral(Position position, double value)
+    : INHERITED(position, kFloat_Kind)
+    , fValue(value) {}
+
+    std::string description() const override {
+        return to_string(fValue);

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

nit: "std::to_string"

(Same comment in other files.)

[ethannicholas, 2016/06/20 17:45:49]

std::to_string isn't present on some Android versions. This is a call to an SkSL
function.

[dogben, 2016/06/20 18:26:26]

Sorry! I haven't gotten used to the "don't include anything unless you have to"
Skia style.

+    }
+
+    const double fValue;
+
+    typedef ASTExpression INHERITED;
+};
+
+} // namespace
+
+#endif