Support building WebRTC without audio and video for Android

webrtc/sdk/android/src/jni/media_jni.h

+/*
+ *  Copyright 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SDK_ANDROID_SRC_JNI_MEDIA_JNI_H_
+#define WEBRTC_SDK_ANDROID_SRC_JNI_MEDIA_JNI_H_
+
+#include "webrtc/api/peerconnectioninterface.h"
+#include "webrtc/base/scoped_ref_ptr.h"
+#include "webrtc/base/thread.h"
+
+namespace webrtc_jni {
+
+rtc::scoped_refptr<webrtc::PeerConnectionFactoryInterface>
+CreateNativePeerConnectionFactory(
+    rtc::Thread* network_thread,
+    rtc::Thread* worker_thread,
+    rtc::Thread* signaling_thread,
+    webrtc::AudioDeviceModule* default_adm,
+    rtc::scoped_refptr<webrtc::AudioEncoderFactory> audio_encoder_factory,
+    rtc::scoped_refptr<webrtc::AudioDecoderFactory> audio_decoder_factory,
+    cricket::WebRtcVideoEncoderFactory* video_encoder_factory,
+    cricket::WebRtcVideoDecoderFactory* video_decoder_factory);
+
+}  // namespace webrtc_jni
+
+#endif  // WEBRTC_SDK_ANDROID_SRC_JNI_MEDIA_JNI_H_