Use glGetStringi to get extensions when available.

src/gpu/gl/GrGLContextInfo.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef GrGLContextInfo_DEFINED
 #define GrGLContextInfo_DEFINED
 
+#include "gl/GrGLExtensions.h"
 #include "gl/GrGLInterface.h"
 #include "GrGLCaps.h"
 #include "GrGLSL.h"
 #include "GrGLUtil.h"
 
 #include "SkString.h"
 
 /**
  * Encapsulates information about an OpenGL context including the GrGLInterface
  * used to make GL calls, the OpenGL version, the GrGLBinding type of the
@@ skipping 41 matching lines @@
     GrGLCaps& caps() { return fGLCaps; }
 
     /**
      * Checks for extension support using a cached copy of the GL_EXTENSIONS
      * string.
      */
     bool hasExtension(const char* ext) const {
         if (!this->isInitialized()) {
             return false;
         }
-        return GrGLHasExtensionFromString(ext, fExtensionString.c_str());
+        return fExtensions.has(ext);
     }
 
 private:
     void reset();
 
     const GrGLInterface* fInterface;
     GrGLBinding          fBindingInUse;
     GrGLVersion          fGLVersion;
     GrGLSLGeneration     fGLSLGeneration;
     GrGLVendor           fVendor;
-    SkString             fExtensionString;
+    GrGLExtensions       fExtensions;
     GrGLCaps             fGLCaps;
 };
 
 #endif