Adding data channel ID to Java binding of DataChannel.

webrtc/api/android/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 838 matching lines @@
 JOW(void, DataChannel_unregisterObserverNative)(
     JNIEnv* jni, jobject j_dc, jlong native_observer) {
   ExtractNativeDC(jni, j_dc)->UnregisterObserver();
   delete reinterpret_cast<DataChannelObserverWrapper*>(native_observer);
 }
 
 JOW(jstring, DataChannel_label)(JNIEnv* jni, jobject j_dc) {
   return JavaStringFromStdString(jni, ExtractNativeDC(jni, j_dc)->label());
 }
 
+JOW(jint, DataChannel_id)(JNIEnv* jni, jobject j_dc) {
+  int id = ExtractNativeDC(jni, j_dc)->id();
+  RTC_CHECK_LE(id, std::numeric_limits<int32_t>::max())
+      << "id overflowed jint!";
+  return static_cast<jint>(id);
+}
+
 JOW(jobject, DataChannel_state)(JNIEnv* jni, jobject j_dc) {
   return JavaEnumFromIndex(
       jni, "DataChannel$State", ExtractNativeDC(jni, j_dc)->state());
 }
 
 JOW(jlong, DataChannel_bufferedAmount)(JNIEnv* jni, jobject j_dc) {
   uint64_t buffered_amount = ExtractNativeDC(jni, j_dc)->buffered_amount();
   RTC_CHECK_LE(buffered_amount, std::numeric_limits<int64_t>::max())
       << "buffered_amount overflowed jlong!";
   return static_cast<jlong>(buffered_amount);
@@ skipping 1530 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