增加换肤功能

Pods/Protobuf/objectivec/GPBRootObject_PackagePrivate.h

@@ -0,0 +1,23 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file or at
+// https://developers.google.com/open-source/licenses/bsd
+
+#import <Foundation/Foundation.h>
+
+#import "GPBRootObject.h"
+
+#import "GPBDescriptor.h"
+
+@interface GPBRootObject ()
+
+// Globally register.
++ (void)globallyRegisterExtension:(GPBExtensionDescriptor *)field;
+
+@end
+
+// Returns YES if the selector was resolved and added to the class,
+// NO otherwise.
+BOOL GPBResolveExtensionClassMethod(Class self, SEL sel);