Added option to specify a maximum file size when recording an AEC dump.

talk/media/webrtc/webrtcvoiceengine.h

Index: talk/media/webrtc/webrtcvoiceengine.h
diff --git a/talk/media/webrtc/webrtcvoiceengine.h b/talk/media/webrtc/webrtcvoiceengine.h
index 0f2f59e4928f0ea619adb5e7088fc3b524388bf5..ce3bdf3ed70641f78aa8a4ca6fef6433d7018cc8 100644
--- a/talk/media/webrtc/webrtcvoiceengine.h
+++ b/talk/media/webrtc/webrtcvoiceengine.h
@@ -94,8 +94,11 @@ class WebRtcVoiceEngine final : public webrtc::TraceCallback  {
   // Set the external ADM. This can only be called before Init.
   bool SetAudioDeviceModule(webrtc::AudioDeviceModule* adm);
 
-  // Starts AEC dump using existing file.
-  bool StartAecDump(rtc::PlatformFile file);
+  // Starts AEC dump using an existing file. A maximum file size in bytes can be
+  // specified. When the maximum file size is reached, logging is stopped and
+  // the file is closed. If max_size_bytes is set to <= 0, no limit will be
+  // used.
+  bool StartAecDump(rtc::PlatformFile file, int64_t max_size_bytes);
 
   // Stops AEC dump.
   void StopAecDump();