Sort GL extension strings and search to find.

include/gpu/gl/GrGLExtensions.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLExtensions_DEFINED
 #define GrGLExtensions_DEFINED
 
@@ skipping 14 matching lines @@
     }
     /**
      * We sometimes need to use this class without having yet created a GrGLInterface. This version
      * of init expects that getString is always non-NULL while getIntegerv and getStringi are non-
      * NULL if on desktop GL with version 3.0 or higher. Otherwise it will fail.
      */
     bool init(GrGLBinding binding,
               GrGLGetStringProc getString,
               GrGLGetStringiProc getStringi,
               GrGLGetIntegervProc getIntegerv);
-    
+
     /**
      * Queries whether an extension is present. This will fail if init() has not been called.
      */
     bool has(const char*) const;
     
     void reset() { fStrings.reset(); }
 
 private:
     SkTArray<SkString> fStrings;
 };
 
 #endif