Add option to print peer connection factory Java stack traces.

talk/app/webrtc/java/jni/classreferenceholder.cc

 /*
  * libjingle
  * Copyright 2015 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 80 matching lines @@
   bool is_egl14_supported = jni->CallStaticBooleanMethod(
       j_egl_base_class, j_is_egl14_supported_method);
   CHECK_EXCEPTION(jni);
   if (is_egl14_supported) {
     LoadClass(jni, "android/opengl/EGLContext");
   }
 #endif
   LoadClass(jni, "org/webrtc/MediaSource$State");
   LoadClass(jni, "org/webrtc/MediaStream");
   LoadClass(jni, "org/webrtc/MediaStreamTrack$State");
+  LoadClass(jni, "org/webrtc/PeerConnectionFactory");
   LoadClass(jni, "org/webrtc/PeerConnection$BundlePolicy");
   LoadClass(jni, "org/webrtc/PeerConnection$ContinualGatheringPolicy");
   LoadClass(jni, "org/webrtc/PeerConnection$RtcpMuxPolicy");
   LoadClass(jni, "org/webrtc/PeerConnection$IceConnectionState");
   LoadClass(jni, "org/webrtc/PeerConnection$IceGatheringState");
   LoadClass(jni, "org/webrtc/PeerConnection$IceTransportsType");
   LoadClass(jni, "org/webrtc/PeerConnection$TcpCandidatePolicy");
   LoadClass(jni, "org/webrtc/PeerConnection$KeyType");
   LoadClass(jni, "org/webrtc/PeerConnection$SignalingState");
   LoadClass(jni, "org/webrtc/SessionDescription");
@@ skipping 34 matching lines @@
   RTC_CHECK(inserted) << "Duplicate class name: " << name;
 }
 
 // Returns a global reference guaranteed to be valid for the lifetime of the
 // process.
 jclass FindClass(JNIEnv* jni, const char* name) {
   return g_class_reference_holder->GetClass(name);
 }
 
 }  // namespace webrtc_jni