Adds WebMClusterParserTest coverage for duration default/estimation/fallback logic

media/formats/webm/webm_cluster_parser.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/formats/webm/webm_cluster_parser.h"
 
 #include <vector>
 
 #include "base/logging.h"
 #include "base/sys_byteorder.h"
 #include "media/base/buffers.h"
 #include "media/base/decrypt_config.h"
 #include "media/filters/webvtt_util.h"
 #include "media/formats/webm/webm_constants.h"
 #include "media/formats/webm/webm_crypto_helpers.h"
 #include "media/formats/webm/webm_webvtt_parser.h"
 
-// Arbitrarily-chosen numbers to estimate the duration of a buffer if none is
-// set and there is not enough information to get a better estimate.
-// TODO(wolenetz/acolwell): Parse audio codebook to determine missing audio
-// frame durations. See http://crbug.com/351166.
-static int kDefaultAudioBufferDurationInMs = 23;  // Common 1k samples @44.1kHz
-static int kDefaultVideoBufferDurationInMs = 42;  // Low 24fps to reduce stalls
-
 namespace media {
 
 WebMClusterParser::WebMClusterParser(
     int64 timecode_scale,
     int audio_track_num,
     base::TimeDelta audio_default_duration,
     int video_track_num,
     base::TimeDelta video_default_duration,
     const WebMTracksParser::TextTracks& text_tracks,
     const std::set<int64>& ignored_tracks,
@@ skipping 546 matching lines @@
 WebMClusterParser::FindTextTrack(int track_num) {
   const TextTrackMap::iterator it = text_track_map_.find(track_num);
 
   if (it == text_track_map_.end())
     return NULL;
 
   return &it->second;
 }
 
 }  // namespace media