Log to webrtc logging stream from java code.

talk/app/webrtc/java/jni/peerconnection_jni.cc

 /*
  * libjingle
  * Copyright 2013 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *  1. Redistributions of source code must retain the above copyright notice,
  *     this list of conditions and the following disclaimer.
  *  2. Redistributions in binary form must reproduce the above copyright notice,
@@ skipping 910 matching lines @@
 
 JOW(void, Logging_nativeEnableLogThreads)(JNIEnv* jni, jclass) {
   rtc::LogMessage::LogThreads(true);
 }
 
 JOW(void, Logging_nativeEnableLogTimeStamps)(JNIEnv* jni, jclass) {
   rtc::LogMessage::LogTimestamps(true);
 }
 
 JOW(void, Logging_nativeLog)(
-    JNIEnv* jni, jclass, jint j_severity, jstring j_message) {
+    JNIEnv* jni, jclass, jint j_severity, jstring j_tag, jstring j_message) {
   std::string message = JavaToStdString(jni, j_message);
-  LOG_V(static_cast<rtc::LoggingSeverity>(j_severity)) << message;
+  std::string tag = JavaToStdString(jni, j_tag);
+  LOG_TAG(static_cast<rtc::LoggingSeverity>(j_severity), tag) << message;
 }
 
 JOW(void, PeerConnection_freePeerConnection)(JNIEnv*, jclass, jlong j_p) {
   CHECK_RELEASE(reinterpret_cast<PeerConnectionInterface*>(j_p));
 }
 
 JOW(void, PeerConnection_freeObserver)(JNIEnv*, jclass, jlong j_p) {
   PCOJava* p = reinterpret_cast<PCOJava*>(j_p);
   delete p;
 }
@@ skipping 875 matching lines @@
   rtc::scoped_ptr<jbyte> buffer(static_cast<jbyte*>(malloc(log_size)));
   stream->ReadAll(buffer.get(), log_size, &read, nullptr);
 
   jbyteArray result = jni->NewByteArray(read);
   jni->SetByteArrayRegion(result, 0, read, buffer.get());
 
   return result;
 }
 
 }  // namespace webrtc_jni