Add methods for telling V8 how much memory audio/video is using.

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 <limits>
 #include <list>
 
@@ skipping 1292 matching lines @@
   if (type == DemuxerStream::AUDIO)
     return audio_.get();
 
   return NULL;
 }
 
 TimeDelta ChunkDemuxer::GetStartTime() const {
   return TimeDelta();
 }
 
+int64_t ChunkDemuxer::GetMemoryUsage() const {

[wolenetz, 2015/10/24 00:51:34]

While it would be interesting to see a machine that could validly have >
(2^(8*sizeof(size_t) - 1)) bytes per stream buffered, why does this method:
1) allow negative retval?
2) not just use size_t retval?

I suppose there's a degenerate case, also, where audio+video could overflow
size_t, too.

[DaleCurtis, 2015/10/24 00:55:55]

I used int64_t since that's what v8 uses:

https://code.google.com/p/chromium/codesearch#chromium/src/v8/include/v8.h&l=...

The only other reason is so that I could use a -1 in the PipelineStatistics
class, but we could surface a size_t out instead everywhere except before we
hand into v8 w/ a checked cast.

+  base::AutoLock auto_lock(lock_);
+  return (audio_ ? audio_->GetBufferedSize() : 0) +
+         (video_ ? video_->GetBufferedSize() : 0);
+}
+
 void ChunkDemuxer::StartWaitingForSeek(TimeDelta seek_time) {
   DVLOG(1) << "StartWaitingForSeek()";
   base::AutoLock auto_lock(lock_);
   DCHECK(state_ == INITIALIZED || state_ == ENDED || state_ == SHUTDOWN ||
          state_ == PARSE_ERROR) << state_;
   DCHECK(seek_cb_.is_null());
 
   if (state_ == SHUTDOWN || state_ == PARSE_ERROR)
     return;
 
@@ skipping 635 matching lines @@
 }
 
 void ChunkDemuxer::ShutdownAllStreams() {
   for (SourceStateMap::iterator itr = source_state_map_.begin();
        itr != source_state_map_.end(); ++itr) {
     itr->second->Shutdown();
   }
 }
 
 }  // namespace media