Annotate libjingle_peerconnection_java with @Nullable.

Bug: webrtc:8881
Change-Id: Ida2ef6c003567d19529c21629c916ed40e8de3a6
Reviewed-on: https://webrtc-review.googlesource.com/63380
Commit-Queue: Sami Kalliomäki <sakal@webrtc.org>
Reviewed-by: Paulina Hensman <phensman@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22563}
diff --git a/sdk/android/api/org/webrtc/Camera2Capturer.java b/sdk/android/api/org/webrtc/Camera2Capturer.java
index 769a94a..423c621 100644
--- a/sdk/android/api/org/webrtc/Camera2Capturer.java
+++ b/sdk/android/api/org/webrtc/Camera2Capturer.java
@@ -14,11 +14,12 @@
 import android.content.Context;
 import android.hardware.camera2.CameraManager;
 import android.media.MediaRecorder;
+import javax.annotation.Nullable;
 
 @TargetApi(21)
 public class Camera2Capturer extends CameraCapturer {
   private final Context context;
-  private final CameraManager cameraManager;
+  @Nullable private final CameraManager cameraManager;
 
   public Camera2Capturer(Context context, String cameraName, CameraEventsHandler eventsHandler) {
     super(cameraName, eventsHandler, new Camera2Enumerator(context));