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

webrtc/api/java/jni/jni_helpers.cc

Index: webrtc/api/java/jni/jni_helpers.cc
diff --git a/webrtc/api/java/jni/jni_helpers.cc b/webrtc/api/java/jni/jni_helpers.cc
index f42abc703e6ce613e47837a9107eff7eee78dd09..052dcf9a8960b255af8950a89d9434650328d8a4 100644
--- a/webrtc/api/java/jni/jni_helpers.cc
+++ b/webrtc/api/java/jni/jni_helpers.cc
@@ -176,7 +176,13 @@ jclass GetObjectClass(JNIEnv* jni, jobject object) {
 jobject GetObjectField(JNIEnv* jni, jobject object, jfieldID id) {
   jobject o = jni->GetObjectField(object, id);
   CHECK_EXCEPTION(jni) << "error during GetObjectField";

[pthatcher1, 2016/04/11 19:39:29]

Can't you replace this with GetNullableObjectField?

[Taylor Brandstetter, 2016/04/11 23:13:38]

True.

-  RTC_CHECK(o) << "GetObjectField returned NULL";
+  RTC_CHECK(!IsNull(jni, o)) << "GetObjectField returned NULL";
+  return o;
+}
+
+jobject GetNullableObjectField(JNIEnv* jni, jobject object, jfieldID id) {
+  jobject o = jni->GetObjectField(object, id);
+  CHECK_EXCEPTION(jni) << "error during GetObjectField";
   return o;
 }