Add support for EGLImage to GrGLInterface

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.
+ * use the latter if it is available. It also will query for EGL extensions if a eglQueryString
+ * implementation is provided.
  */
 class SK_API GrGLExtensions {
 public:
     GrGLExtensions() : fInitialized(false), fStrings(new SkTArray<SkString>) {}
 
     GrGLExtensions(const GrGLExtensions&);
 
     GrGLExtensions& operator=(const GrGLExtensions&);
 
     void swap(GrGLExtensions* that) {
         fStrings.swap(that->fStrings);
         SkTSwap(fInitialized, that->fInitialized);
     }
 
     /**
      * 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(GrGLStandard standard,
               GrGLGetStringProc getString,
               GrGLGetStringiProc getStringi,
-              GrGLGetIntegervProc getIntegerv);
+              GrGLGetIntegervProc getIntegerv,
+              GrEGLQueryStringProc queryString,
+              GrEGLDisplay eglDisplay);
 
     bool isInitialized() const { return fInitialized; }
 
     /**
      * Queries whether an extension is present. This will fail if init() has not been called.
      */
     bool has(const char[]) const;
 
     /**
      * Removes an extension if present. Returns true if the extension was present before the call.
      */
     bool remove(const char[]);
 
     /**
      * Adds an extension to list
      */
     void add(const char[]);
 
     void reset() { fStrings->reset(); }
 
     void print(const char* sep = "\n") const;
 
 private:
     bool                                fInitialized;
     SkAutoTDelete<SkTArray<SkString> >  fStrings;
 };
 
 #endif