SkSL performance improvements

src/sksl/SkSLCompiler.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_COMPILER
 #define SKSL_COMPILER
 
 #include <vector>
 #include "ir/SkSLProgram.h"
 #include "ir/SkSLSymbolTable.h"
+#include "SkSLContext.h"
 #include "SkSLErrorReporter.h"
 
 namespace SkSL {
 
 class IRGenerator;
 
 /**
  * Main compiler entry point. This is a traditional compiler design which first parses the .sksl
  * file into an abstract syntax tree (a tree of ASTNodes), then performs semantic analysis to 
  * produce a Program (a tree of IRNodes), then feeds the Program into a CodeGenerator to produce
@@ skipping 19 matching lines @@
 
 private:
 
     void internalConvertProgram(std::string text,
                                                         std::vector<std::unique_ptr<ProgramElement>>* result);
 
     std::shared_ptr<SymbolTable> fTypes;
     IRGenerator* fIRGenerator;
     std::string fSkiaVertText; // FIXME store parsed version instead
 
+    Context fContext;
     int fErrorCount;
     std::string fErrorText;
 };
 
 } // namespace
 
 #endif