Adding AecDump functionality to AppRTCDemo for iOS

webrtc/sdk/objc/Framework/Headers/WebRTC/RTCPeerConnectionFactory.h

 /*
  *  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.
  */
 
@@ skipping 35 matching lines @@
 /** Initialize an RTCPeerConnection with a configuration, constraints, and
  *  delegate.
  */
 - (RTCPeerConnection *)peerConnectionWithConfiguration:
     (RTCConfiguration *)configuration
                                            constraints:
     (RTCMediaConstraints *)constraints
                                               delegate:
     (nullable id<RTCPeerConnectionDelegate>)delegate;
 
+/** Start an aecdump recording with a file descriptor and
+    a specified maximum size limit (-1 specifies that no
+    limit should be used).
+    This API call will likely change in the future */
+- (BOOL)startAecDumpWithFileDescriptor:(int)fileDescriptor
+                    maxFileSizeInBytes:(int)maxFileSizeInBytes;
+
+/* Stop an active aecdump recording */
+- (void)stopAecDump;
+
 @end
 
 NS_ASSUME_NONNULL_END