Set handles in JNI_PeerConnectionFactory to ensure dispose removes all native objects

Signed-off-by: Joshua Castle <26531652+Kas-tle@users.noreply.github.com>

Author: Kas-tle

webrtc-jni/src/main/cpp/src/JNI_PeerConnectionFactory.cpp

@@ -32,20 +32,23 @@ JNIEXPORT void JNICALL Java_dev_kastle_webrtc_PeerConnectionFactory_initialize
         env->Throw(jni::JavaRuntimeException(env, "Start network thread failed"));
         return;
     }
+    SetHandle(env, caller, "networkThreadHandle", networkThread.get());
 
     std::unique_ptr<webrtc::Thread> signalingThread = webrtc::Thread::Create();
     signalingThread->SetName("webrtc_jni_signaling_thread", nullptr);
     if (!signalingThread->Start()) {
         env->Throw(jni::JavaRuntimeException(env, "Start signaling thread failed"));
         return;
     }
+    SetHandle(env, caller, "signalingThreadHandle", signalingThread.get());
 
     std::unique_ptr<webrtc::Thread> workerThread = webrtc::Thread::Create();
     workerThread->SetName("webrtc_jni_worker_thread", nullptr);
     if (!workerThread->Start()) {
         env->Throw(jni::JavaRuntimeException(env, "Start worker thread failed"));
         return;
     }
+    SetHandle(env, caller, "workerThreadHandle", workerThread.get());
 
     webrtc::PeerConnectionFactoryDependencies dependencies;