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diff --git a/media/blink/buffered_data_source_host_impl.h b/media/blink/buffered_data_source_host_impl.h
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+++ b/media/blink/buffered_data_source_host_impl.h
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+// 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.
+
+#ifndef MEDIA_BLINK_BUFFERED_DATA_SOURCE_HOST_IMPL_H_
+#define MEDIA_BLINK_BUFFERED_DATA_SOURCE_HOST_IMPL_H_
+
+#include "base/time/time.h"
+#include "media/base/media_export.h"
+#include "media/base/ranges.h"
+#include "media/blink/buffered_data_source.h"
+
+namespace media {
+
+// Provides an implementation of BufferedDataSourceHost that translates the
+// buffered byte ranges into estimated time ranges.
+class MEDIA_EXPORT BufferedDataSourceHostImpl
+    : public BufferedDataSourceHost {
+ public:
+  BufferedDataSourceHostImpl();
+  virtual ~BufferedDataSourceHostImpl();
+
+  // BufferedDataSourceHost implementation.
+  virtual void SetTotalBytes(int64 total_bytes) OVERRIDE;
+  virtual void AddBufferedByteRange(int64 start, int64 end) OVERRIDE;
+
+  // Translate the byte ranges to time ranges and append them to the list.
+  // TODO(sandersd): This is a confusing name, find something better.
+  void AddBufferedTimeRanges(
+      Ranges<base::TimeDelta>* buffered_time_ranges,
+      base::TimeDelta media_duration) const;
+
+  bool DidLoadingProgress();
+
+ private:
+  // Total size of the data source.
+  int64 total_bytes_;
+
+  // List of buffered byte ranges for estimating buffered time.
+  Ranges<int64> buffered_byte_ranges_;
+
+  // True when AddBufferedByteRange() has been called more recently than
+  // DidLoadingProgress().
+  bool did_loading_progress_;
+
+  DISALLOW_COPY_AND_ASSIGN(BufferedDataSourceHostImpl);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_BLINK_BUFFERED_DATA_SOURCE_HOST_IMPL_H_