diff -r 000000000000 -r 6474c204b198 gfx/angle/src/compiler/preprocessor/Lexer.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/angle/src/compiler/preprocessor/Lexer.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,25 @@
+//
+// Copyright (c) 2012 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+#ifndef COMPILER_PREPROCESSOR_LEXER_H_
+#define COMPILER_PREPROCESSOR_LEXER_H_
+
+namespace pp
+{
+
+struct Token;
+
+class Lexer
+{
+  public:
+    virtual ~Lexer();
+
+    virtual void lex(Token* token) = 0;
+};
+
+}  // namespace pp
+#endif  // COMPILER_PREPROCESSOR_LEXER_H_
+