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/RtpParameters.java b/sdk/android/api/org/webrtc/RtpParameters.java
index 28ce6aa..634f3b3 100644
--- a/sdk/android/api/org/webrtc/RtpParameters.java
+++ b/sdk/android/api/org/webrtc/RtpParameters.java
@@ -10,6 +10,7 @@
 
 package org.webrtc;
 
+import javax.annotation.Nullable;
 import java.util.List;
 import java.util.ArrayList;
 import org.webrtc.MediaStreamTrack;
@@ -31,7 +32,7 @@
     // If non-null, this represents the Transport Independent Application
     // Specific maximum bandwidth defined in RFC3890. If null, there is no
     // maximum bitrate.
-    public Integer maxBitrateBps;
+    @Nullable public Integer maxBitrateBps;
     // SSRC to be used by this encoding.
     // Can't be changed between getParameters/setParameters.
     public Long ssrc;
@@ -48,6 +49,7 @@
       return active;
     }
 
+    @Nullable
     @CalledByNative("Encoding")
     Integer getMaxBitrateBps() {
       return maxBitrateBps;