added initial GLSL support to skslc

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 "SkSLContext.h"
 #include "SkSLExpression.h"
 
 namespace SkSL {
 
 /**
  * Represents 'true' or 'false'.
  */
 struct BoolLiteral : public Expression {
     BoolLiteral(const Context& context, Position position, bool value)
     : INHERITED(position, kBoolLiteral_Kind, *context.fBool_Type)
     , fValue(value) {}
 
     std::string description() const override {
         return fValue ? "true" : "false";
     }
 
     bool isConstant() const override {
-        return true;
+        return true;
     }
 
     const bool fValue;
 
     typedef Expression INHERITED;
 };
 
 } // namespace
 
 #endif