Add implementation and tests for RTCIceServer

webrtc/api/objc/WebRTC-Prefix.pch

Index: webrtc/api/objc/WebRTC-Prefix.pch
diff --git a/webrtc/base/atomicops_unittest.cc b/webrtc/api/objc/WebRTC-Prefix.pch
similarity index 67%
copy from webrtc/base/atomicops_unittest.cc
copy to webrtc/api/objc/WebRTC-Prefix.pch
index 2aa28cac61be8ebcacd145565734016076b66506..990b1602da936a98a04b315411b2487aaaf904e5 100644
--- a/webrtc/base/atomicops_unittest.cc
+++ b/webrtc/api/objc/WebRTC-Prefix.pch
@@ -1,5 +1,5 @@
 /*
- *  Copyright 2011 The WebRTC Project Authors. All rights reserved.
+ *  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
@@ -8,5 +8,6 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-// TODO(pbos): Move AtomicOps tests to here from
-// webrtc/base/criticalsection_unittest.cc.
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif