Speculative revert by sheriff

media/tools/player_x11/data_source_logger.h

+// 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.
+
+#ifndef MEDIA_TOOLS_PLAYER_X11_DATA_SOURCE_LOGGER_H_
+#define MEDIA_TOOLS_PLAYER_X11_DATA_SOURCE_LOGGER_H_
+
+#include "media/base/data_source.h"
+
+// Logs all DataSource operations to VLOG(1) for debugging purposes.
+class DataSourceLogger : public media::DataSource {
+ public:
+  // Constructs a DataSourceLogger to log operations against another DataSource.
+  //
+  // |data_source| must be initialized in advance.
+  //
+  // |streaming| when set to true will override the implementation
+  // IsStreaming() to always return true, otherwise it will delegate to
+  // |data_source|.
+  DataSourceLogger(scoped_ptr<DataSource> data_source,
+                   bool force_streaming);
+  ~DataSourceLogger() override;
+
+  // media::DataSource implementation.
+  void Stop() override;
+  void Read(int64 position,
+            int size,
+            uint8* data,
+            const media::DataSource::ReadCB& read_cb) override;
+  bool GetSize(int64* size_out) override;
+  bool IsStreaming() override;
+  void SetBitrate(int bitrate) override;
+
+ private:
+  scoped_ptr<media::DataSource> data_source_;
+  bool streaming_;
+
+  DISALLOW_COPY_AND_ASSIGN(DataSourceLogger);
+};
+
+#endif  // MEDIA_TOOLS_PLAYER_X11_DATA_SOURCE_LOGGER_H_