Reland Use CopyOnWriteBuffer instead of Buffer to avoid unnecessary copies.

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 875 matching lines @@
 }
 
 JOW(void, DataChannel_close)(JNIEnv* jni, jobject j_dc) {
   ExtractNativeDC(jni, j_dc)->Close();
 }
 
 JOW(jboolean, DataChannel_sendNative)(JNIEnv* jni, jobject j_dc,
                                       jbyteArray data, jboolean binary) {
   jbyte* bytes = jni->GetByteArrayElements(data, NULL);
   bool ret = ExtractNativeDC(jni, j_dc)->Send(DataBuffer(
-      rtc::Buffer(bytes, jni->GetArrayLength(data)),
+      rtc::CopyOnWriteBuffer(bytes, jni->GetArrayLength(data)),
       binary));
   jni->ReleaseByteArrayElements(data, bytes, JNI_ABORT);
   return ret;
 }
 
 JOW(void, DataChannel_dispose)(JNIEnv* jni, jobject j_dc) {
   CHECK_RELEASE(ExtractNativeDC(jni, j_dc));
 }
 
 JOW(void, Logging_nativeEnableTracing)(
@@ skipping 1197 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