Move GrGLExtensions from GrGLContextInfo to GrGLInterface

include/core/SkTemplates.h

Index: include/core/SkTemplates.h
diff --git a/include/core/SkTemplates.h b/include/core/SkTemplates.h
index 5005713b05a3a84dbb45af8a85002a132444d4db..76254e00ee2ac710b8ad63f260ac82274db99b80 100644
--- a/include/core/SkTemplates.h
+++ b/include/core/SkTemplates.h
@@ -143,6 +143,10 @@ public:
         return obj;
     }
 
+    void swap(SkAutoTDelete* that) {
+        SkTSwap(fObj, that->fObj);
+    }
+
 private:
     T*  fObj;
 };