Log the tag in native log stream.

webrtc/base/logging.cc

 /*
  *  Copyright 2004 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 166 matching lines @@
     extra_ = tmp.str();
   }
 }
 
 LogMessage::LogMessage(const char* file,
                        int line,
                        LoggingSeverity sev,
                        const std::string& tag)
     : LogMessage(file, line, sev, ERRCTX_NONE, 0 /* err */, NULL /* module */) {
   tag_ = tag;
+  print_stream_ << tag << ": ";
 }
 
 LogMessage::~LogMessage() {
   if (!extra_.empty())
     print_stream_ << " : " << extra_;
   print_stream_ << std::endl;
 
   const std::string& str = print_stream_.str();
   if (severity_ >= dbg_sev_) {
     OutputToDebug(str, severity_, tag_);
@@ skipping 356 matching lines @@
   }
 
   if (state) {
     state->unprintable_count_[input] = consecutive_unprintable;
   }
 }
 
 //////////////////////////////////////////////////////////////////////
 
 }  // namespace rtc