Allowing a Java object field to be null in a new JNI helper method.

webrtc/api/java/jni/peerconnection_jni.cc

 /*
  *  Copyright 2013 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.
  */
 
@@ skipping 2024 matching lines @@
   jfieldID active_id =
       GetFieldID(jni, j_encoding_parameters_class, "active", "Z");
   jfieldID bitrate_id = GetFieldID(jni, j_encoding_parameters_class,
                                    "maxBitrateBps", "Ljava/lang/Integer;");
   jclass j_integer_class = jni->FindClass("java/lang/Integer");
   jmethodID int_value_id = GetMethodID(jni, j_integer_class, "intValue", "()I");
 
   for (jobject j_encoding_parameters : Iterable(jni, j_encodings)) {
     webrtc::RtpEncodingParameters encoding;
     encoding.active = GetBooleanField(jni, j_encoding_parameters, active_id);
-    jobject j_bitrate = GetObjectField(jni, j_encoding_parameters, bitrate_id);
+    jobject j_bitrate =
+        GetNullableObjectField(jni, j_encoding_parameters, bitrate_id);
     if (!IsNull(jni, j_bitrate)) {
       int bitrate_value = jni->CallIntMethod(j_bitrate, int_value_id);
       CHECK_EXCEPTION(jni) << "error during CallIntMethod";
       encoding.max_bitrate_bps = bitrate_value;
     } else {
       encoding.max_bitrate_bps = kBitrateUnlimited;
     }
     encodings->push_back(encoding);
   }
   return true;
@@ skipping 89 matching lines @@
   return JavaStringFromStdString(
       jni,
       reinterpret_cast<RtpReceiverInterface*>(j_rtp_receiver_pointer)->id());
 }
 
 JOW(void, RtpReceiver_free)(JNIEnv* jni, jclass, jlong j_rtp_receiver_pointer) {
   reinterpret_cast<RtpReceiverInterface*>(j_rtp_receiver_pointer)->Release();
 }
 
 }  // namespace webrtc_jni