Add publicly visible mock for PeerConnectionFactoryInterface

Bug: webrtc:11642
Change-Id: I71c99034a70780d4d1ffc8330836c76c6105bc96
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/176421
Commit-Queue: Steve Anton <steveanton@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31430}
diff --git a/api/test/compile_all_headers.cc b/api/test/compile_all_headers.cc
index d9cc82c..f7d84da 100644
--- a/api/test/compile_all_headers.cc
+++ b/api/test/compile_all_headers.cc
@@ -34,6 +34,7 @@
 #include "api/test/mock_audio_mixer.h"
 #include "api/test/mock_frame_decryptor.h"
 #include "api/test/mock_frame_encryptor.h"
+#include "api/test/mock_peer_connection_factory_interface.h"
 #include "api/test/mock_peerconnectioninterface.h"
 #include "api/test/mock_rtpreceiver.h"
 #include "api/test/mock_rtpsender.h"