Move GrGLExtensions from GrGLContextInfo 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 "GrGLInterface.h"
+#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 GrGLExtensions : public SkNoncopyable {
 public:
-    bool init(const GrGLInterface* iface) {
-        return this->init(iface->fStandard,
-                          iface->fGetString,
-                          iface->fGetStringi,
-                          iface->fGetIntegerv);
+
+    GrGLExtensions() : fInitialized(false), fStrings(SkNEW(SkTArray<SkString>)) {}
+
+    void swap(GrGLExtensions* that) {
+        fStrings.swap(&that->fStrings);
     }
+
     /**
      * 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);
 
+    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;
 
-    void reset() { fStrings.reset(); }
+    void reset() { fStrings->reset(); }
 
     void print(const char* sep = "\n") const;
 
 private:
-    SkTArray<SkString> fStrings;
+    bool                                fInitialized;
+    SkAutoTDelete<SkTArray<SkString> >  fStrings;
 };
 
 #endif