Split out methods in GrGpuResource::CacheAccess that can be called outside of the cache.

include/gpu/GrGpuResource.h

Index: include/gpu/GrGpuResource.h
diff --git a/include/gpu/GrGpuResource.h b/include/gpu/GrGpuResource.h
index 8e983d89c57b45c36b89fed88e60c5a1c64dfc8a..baffd9ec8343bf04f9c716558003ddbf06b302ec 100644
--- a/include/gpu/GrGpuResource.h
+++ b/include/gpu/GrGpuResource.h
@@ -207,13 +207,20 @@ public:
     const SkData* getCustomData() const { return fData.get(); }
 
     /**
-     * Internal-only helper class used for cache manipulations of the reosurce.
+     * Internal-only helper class used for manipulations of the resource by the cache.
      */
     class CacheAccess;
     inline CacheAccess cacheAccess();
     inline const CacheAccess cacheAccess() const;
 
     /**
+     * Internal-only helper class used for manipulations of the resource by internal code.
+     */
+    class ResourcePriv;
+    inline ResourcePriv resourcePriv();
+    inline const ResourcePriv resourcePriv() const;
+
+    /**
      * Removes references to objects in the underlying 3D API without freeing them.
      * Called by CacheAccess.
      * In general this method should not be called outside of skia. It was