Support adding and removing MediaRecorder to camera 2 session.

webrtc/sdk/android/api/org/webrtc/Camera2Capturer.java

 /*
  *  Copyright 2016 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.
  */
 
 package org.webrtc;
 
 import android.annotation.TargetApi;
 import android.content.Context;
 import android.hardware.camera2.CameraManager;
+import android.media.MediaRecorder;
 
 @TargetApi(21)
 public class Camera2Capturer extends CameraCapturer {
   private final Context context;
   private final CameraManager cameraManager;
 
   public Camera2Capturer(Context context, String cameraName, CameraEventsHandler eventsHandler) {
     super(cameraName, eventsHandler, new Camera2Enumerator(context));
 
     this.context = context;
     cameraManager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
   }
 
   @Override
   protected void createCameraSession(CameraSession.CreateSessionCallback createSessionCallback,
       CameraSession.Events events, Context applicationContext,
-      SurfaceTextureHelper surfaceTextureHelper, String cameraName, int width, int height,
-      int framerate) {
+      SurfaceTextureHelper surfaceTextureHelper, MediaRecorder mediaRecoder, String cameraName,
+      int width, int height, int framerate) {
     Camera2Session.create(createSessionCallback, events, applicationContext, cameraManager,
-        surfaceTextureHelper, cameraName, width, height, framerate);
+        surfaceTextureHelper, mediaRecoder, cameraName, width, height, framerate);
   }
 }