Calculate the buffered ranges in ChunkDemuxer::GetBufferedRanges()

media/filters/chunk_demuxer.h

Index: media/filters/chunk_demuxer.h
diff --git a/media/filters/chunk_demuxer.h b/media/filters/chunk_demuxer.h
index 5755d0b1b4040e724970035967b5c500ad61392a..d87ce56fabf8d1ca6713f63a5e371b13f1fe65dd 100644
--- a/media/filters/chunk_demuxer.h
+++ b/media/filters/chunk_demuxer.h
@@ -119,6 +119,16 @@ class MEDIA_EXPORT ChunkDemuxer : public Demuxer {
   bool OnVideoBuffers(const StreamParser::BufferQueue& buffers);
   bool OnKeyNeeded(scoped_array<uint8> init_data, int init_data_size);
 
+  // Helper functions for calculating GetBufferedRanges().
+  void AddIntersectionRange(
+      SourceBufferStream::TimespanList::const_iterator& itr_a,
+      SourceBufferStream::TimespanList::const_iterator& itr_b,
+      SourceBufferStream::TimespanList::const_iterator itr_a_end,
+      SourceBufferStream::TimespanList::const_iterator itr_b_end,
+      Ranges* ranges_out) const;
+  SourceBufferStream::TimespanList::const_iterator next(
+      SourceBufferStream::TimespanList::const_iterator itr) const;
+
   mutable base::Lock lock_;
   State state_;