Update API for Objective-C RTCIceCandidate.

BUG=
R=tkchin@webrtc.org

Review URL: https://codereview.webrtc.org/1517253005 .

Patch from Jon Hjelle <hjon@andyet.net>.

Cr-Commit-Position: refs/heads/master@{#11156}
diff --git a/webrtc/api/objc/RTCIceCandidate+Private.h b/webrtc/api/objc/RTCIceCandidate+Private.h
new file mode 100644
index 0000000..ca95a43
--- /dev/null
+++ b/webrtc/api/objc/RTCIceCandidate+Private.h
@@ -0,0 +1,36 @@
+/*
+ *  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 "RTCIceCandidate.h"
+
+#include "talk/app/webrtc/jsep.h"
+#include "webrtc/base/scoped_ptr.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface RTCIceCandidate ()
+
+/**
+ * The native IceCandidateInterface representation of this RTCIceCandidate
+ * object. This is needed to pass to the underlying C++ APIs.
+ */
+@property(nonatomic, readonly)
+    rtc::scoped_ptr<webrtc::IceCandidateInterface> nativeCandidate;
+
+/**
+ * Initialize an RTCIceCandidate from a native IceCandidateInterface. No
+ * ownership is taken of the native candidate.
+ */
+- (instancetype)initWithNativeCandidate:
+    (webrtc::IceCandidateInterface *)candidate;
+
+@end
+
+NS_ASSUME_NONNULL_END