Implement "Key Presence" step in "Encrypted Block Encounted" algorithm in EME.

media/filters/chunk_demuxer.cc

 // Copyright (c) 2012 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/filters/chunk_demuxer.h"
 
+#include <algorithm>
+#include <deque>
+
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/message_loop_proxy.h"
 #include "base/string_util.h"
 #include "media/base/audio_decoder_config.h"
 #include "media/base/stream_parser_buffer.h"
 #include "media/base/video_decoder_config.h"
 #include "media/filters/chunk_demuxer_client.h"
@@ skipping 1072 matching lines @@
     (*itr)->SetTimestamp((*itr)->GetTimestamp() + timestamp_offset);
   }
 }
 
 bool ChunkDemuxer::IsValidId(const std::string& source_id) const {
   return source_info_map_.count(source_id) > 0u &&
       stream_parser_map_.count(source_id) > 0u;
 }
 
 }  // namespace media