Enable cpplint for more webrtc subfolders and fix all uncovered cpplint errors.

webrtc/tools/agc/activity_metric.cc

 /*
  *  Copyright (c) 2012 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 47 matching lines @@
 static void DitherSilence(AudioFrame* frame) {
   ASSERT_EQ(1, frame->num_channels_);
   const double kRmsSilence = 5;
   const double sum_squared_silence = kRmsSilence * kRmsSilence *
       frame->samples_per_channel_;
   double sum_squared = 0;
   for (size_t n = 0; n < frame->samples_per_channel_; n++)
     sum_squared += frame->data_[n] * frame->data_[n];
   if (sum_squared <= sum_squared_silence) {
     for (size_t n = 0; n < frame->samples_per_channel_; n++)
-      frame->data_[n] = (rand() & 0xF) - 8;
+      frame->data_[n] = (rand() & 0xF) - 8;  // NOLINT: ignore non-threadsafe.
   }
 }
 
 class AgcStat {
  public:
   AgcStat()
       : video_index_(0),
         activity_threshold_(kDefaultActivityThreshold),
         audio_content_(Histogram::Create(kAgcAnalWindowSamples)),
         audio_processing_(new VadAudioProc()),
@@ skipping 296 matching lines @@
       " one probability per frame.\n"
       "\nUsage:\n\n"
       "activity_metric input_pcm [options]\n"
       "where 'input_pcm' is the input audio sampled at 16 kHz in 16 bits "
       "format.\n\n";
   google::SetUsageMessage(kUsage);
   google::ParseCommandLineFlags(&argc, &argv, true);
   webrtc::void_main(argc, argv);
   return 0;
 }