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..12ad977db8353c2de699d210f6f94fa4690a8de2 100644
--- a/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCPeerConnectionFactory.h
+++ b/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCPeerConnectionFactory.h
@@ -29,6 +29,14 @@ RTC_EXPORT
 
 - (instancetype)init NS_DESIGNATED_INITIALIZER;
 
+/** Start an aecdump recording with a file descriptor and

[tkchin_webrtc, 2016/08/25 17:25:40]

nit: place this after the rest of the methods. 

[peah-webrtc, 2016/08/25 21:23:36]

Done.

+    a specified maximum size limit (-1 specifies that no
+    limit should be used). */
+- (BOOL)startAecDumpWithFileDescriptor:(int)fileDescriptor
+                    maxFileSizeInBytes:(int)maxFileSizeInBytes;
+
+- (void)stopAecDump;
+
 /** Initialize an RTCAVFoundationVideoSource with constraints. */
 - (RTCAVFoundationVideoSource *)avFoundationVideoSourceWithConstraints:
     (nullable RTCMediaConstraints *)constraints;