Adding AecDump functionality to AppRTCDemo for iOS

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

Index: webrtc/sdk/objc/Framework/Headers/WebRTC/RTCPeerConnectionFactory.h
diff --git a/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCPeerConnectionFactory.h b/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCPeerConnectionFactory.h
index f21c107581e9048a2f92adb94315538110b25995..abf2373f3c092e12c4435e11eb6602d530593967 100644
--- a/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCPeerConnectionFactory.h
+++ b/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCPeerConnectionFactory.h
@@ -53,6 +53,16 @@ RTC_EXPORT
                                               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