Update API for Objective-C RTCDataChannel.
BUG=
Review URL: https://codereview.webrtc.org/1545393003
Cr-Commit-Position: refs/heads/master@{#11362}
diff --git a/webrtc/api/objc/RTCDataChannel+Private.h b/webrtc/api/objc/RTCDataChannel+Private.h
new file mode 100644
index 0000000..cc44923
--- /dev/null
+++ b/webrtc/api/objc/RTCDataChannel+Private.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2015 The WebRTC project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+#import "RTCDataChannel.h"
+
+#include "talk/app/webrtc/datachannelinterface.h"
+#include "webrtc/base/scoped_ref_ptr.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface RTCDataBuffer ()
+
+/**
+ * The native DataBuffer representation of this RTCDatabuffer object. This is
+ * needed to pass to the underlying C++ APIs.
+ */
+@property(nonatomic, readonly) const webrtc::DataBuffer *nativeDataBuffer;
+
+/** Initialize an RTCDataBuffer from a native DataBuffer. */
+- (instancetype)initWithNativeBuffer:(const webrtc::DataBuffer&)nativeBuffer;
+
+@end
+
+
+@interface RTCDataChannel ()
+
+/** Initialize an RTCDataChannel from a native DataChannelInterface. */
+- (instancetype)initWithNativeDataChannel:
+ (rtc::scoped_refptr<webrtc::DataChannelInterface>)nativeDataChannel
+ NS_DESIGNATED_INITIALIZER;
+
++ (webrtc::DataChannelInterface::DataState)
+ nativeDataChannelStateForState:(RTCDataChannelState)state;
+
++ (RTCDataChannelState)dataChannelStateForNativeState:
+ (webrtc::DataChannelInterface::DataState)nativeState;
+
++ (NSString *)stringForState:(RTCDataChannelState)state;
+
+@end
+
+NS_ASSUME_NONNULL_END