Relanding: Break peerconnection_jni.cc into multiple files, in "pc" directory.

webrtc/sdk/android/src/jni/null_media_jni.cc

-/*
- *  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.
- */
-
-#include "webrtc/sdk/android/src/jni/media_jni.h"
-
-namespace webrtc_jni {
-
-webrtc::CallFactoryInterface* CreateCallFactory() {
-  return nullptr;
-}
-
-webrtc::RtcEventLogFactoryInterface* CreateRtcEventLogFactory() {
-  return nullptr;
-}
-
-cricket::MediaEngineInterface* CreateMediaEngine(
-    webrtc::AudioDeviceModule* adm,
-    const rtc::scoped_refptr<webrtc::AudioEncoderFactory>&
-        audio_encoder_factory,
-    const rtc::scoped_refptr<webrtc::AudioDecoderFactory>&
-        audio_decoder_factory,
-    cricket::WebRtcVideoEncoderFactory* video_encoder_factory,
-    cricket::WebRtcVideoDecoderFactory* video_decoder_factory,
-    rtc::scoped_refptr<webrtc::AudioMixer> audio_mixer) {
-  return nullptr;
-}
-
-}  // namespace webrtc_jni