Add SK_API to GrGLExtensions

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
 
 #include "GrGLFunctions.h"
 #include "SkString.h"
 #include "SkTArray.h"
 
 struct GrGLInterface;
 
 /**
  * This helper queries the current GL context for its extensions, remembers them, and can be
  * queried. It supports both glGetString- and glGetStringi-style extension string APIs and will
  * use the latter if it is available.
  */
-class GrGLExtensions {
+class SK_API GrGLExtensions {
 public:
     GrGLExtensions() : fInitialized(false), fStrings(SkNEW(SkTArray<SkString>)) {}
 
     GrGLExtensions(const GrGLExtensions&);
 
     GrGLExtensions& operator=(const GrGLExtensions&);
 
     void swap(GrGLExtensions* that) {
         fStrings.swap(&that->fStrings);
         SkTSwap(fInitialized, that->fInitialized);
@@ skipping 29 matching lines @@
     void reset() { fStrings->reset(); }
 
     void print(const char* sep = "\n") const;
 
 private:
     bool                                fInitialized;
     SkAutoTDelete<SkTArray<SkString> >  fStrings;
 };
 
 #endif