Add support for EGLImage to GrGLInterface

include/gpu/gl/GrGLInterface.h

Index: include/gpu/gl/GrGLInterface.h
diff --git a/include/gpu/gl/GrGLInterface.h b/include/gpu/gl/GrGLInterface.h
index 37c6faacdea09cef09be6c12d9a506053a8a209e..149c50409ae85331799c7f0b271d508f1d3b8aa4 100644
--- a/include/gpu/gl/GrGLInterface.h
+++ b/include/gpu/gl/GrGLInterface.h
@@ -128,8 +128,6 @@ private:
     typedef SkRefCnt INHERITED;
 
 public:
-    
-
     GrGLInterface();
 
     static GrGLInterface* NewClone(const GrGLInterface*);
@@ -501,6 +499,10 @@ public:
         GLPtr<GrGLPushDebugGroupProc> fPushDebugGroup;
         GLPtr<GrGLPopDebugGroupProc> fPopDebugGroup;
         GLPtr<GrGLObjectLabelProc> fObjectLabel;
+
+        /* EGL functions */
+        GLPtr<GrEGLCreateImageProc> fCreateImage;
+        GLPtr<GrEGLDestroyImageProc> fDestroyImage;
     } fFunctions;
 
     // Per-GL func callback