Adding a new ChangeLogger class to handle UMA logging of bitrates

webrtc/modules/audio_coding/main/acm2/codec_manager.cc

 /*
  *  Copyright (c) 2015 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.
  */
 
 #include "webrtc/modules/audio_coding/main/acm2/codec_manager.h"
 
 #include "webrtc/base/checks.h"
 #include "webrtc/engine_configurations.h"
 #include "webrtc/modules/audio_coding/main/acm2/acm_codec_database.h"
-#include "webrtc/modules/audio_coding/main/acm2/acm_common_defs.h"
-#include "webrtc/system_wrappers/interface/metrics.h"
 #include "webrtc/system_wrappers/interface/trace.h"
 
 namespace webrtc {
 namespace acm2 {
 
 namespace {
 bool IsCodecRED(const CodecInst& codec) {
   return (STR_CASE_CMP(codec.plname, "RED") == 0);
 }
 
@@ skipping 279 matching lines @@
     DCHECK(codec_owner_.Encoder());
   }
   send_codec_inst_.plfreq = send_codec.plfreq;
   send_codec_inst_.pacsize = send_codec.pacsize;
   send_codec_inst_.channels = send_codec.channels;
   send_codec_inst_.pltype = send_codec.pltype;
 
   // Check if a change in Rate is required.
   if (send_codec.rate != send_codec_inst_.rate) {
     codec_owner_.SpeechEncoder()->SetTargetBitrate(send_codec.rate);
-    RTC_HISTOGRAM_COUNTS_100(
-        HISTOGRAM_NAME_AUDIO_TARGET_BITRATE_IN_KBPS,
-        codec_owner_.SpeechEncoder()->GetTargetBitrate() / 1000);
     send_codec_inst_.rate = send_codec.rate;
   }
 
   codec_fec_enabled_ = codec_fec_enabled_ &&
                        codec_owner_.SpeechEncoder()->SetFec(codec_fec_enabled_);
 
   return 0;
 }
 
 void CodecManager::RegisterEncoder(
@@ skipping 140 matching lines @@
     case 48000:
       return -1;
     default:
       FATAL() << sample_rate_hz << " Hz is not supported";
       return -1;
   }
 }
 
 }  // namespace acm2
 }  // namespace webrtc