Pass a |media_log| to FFmpegVideoDecoder and roll ffmpeg

media/ffmpeg/ffmpeg_common.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_FFMPEG_FFMPEG_COMMON_H_
 #define MEDIA_FFMPEG_FFMPEG_COMMON_H_
 
 #include <stdint.h>
+#include <string>
 
 // Used for FFmpeg error codes.
 #include <cerrno>
 
 #include "base/compiler_specific.h"
 #include "base/time/time.h"
 #include "media/base/audio_codecs.h"
 #include "media/base/channel_layout.h"
 #include "media/base/media_export.h"
 #include "media/base/sample_format.h"
@@ skipping 124 matching lines @@
 // Converts FFmpeg's pixel formats to its corresponding supported video format.
 MEDIA_EXPORT VideoPixelFormat
 AVPixelFormatToVideoPixelFormat(AVPixelFormat pixel_format);
 
 // Converts video formats to its corresponding FFmpeg's pixel formats.
 AVPixelFormat VideoPixelFormatToAVPixelFormat(VideoPixelFormat video_format);
 
 ColorSpace AVColorSpaceToColorSpace(AVColorSpace color_space,
                                     AVColorRange color_range);
 
+// Converts an AVERROR error number to a description.
+std::string AVErrorToString(int errnum);
+
 // Returns a 32-bit hash for the given codec name.  See the VerifyUmaCodecHashes
 // unit test for more information and code for generating the histogram XML.
 MEDIA_EXPORT int32_t HashCodecName(const char* codec_name);
 
 }  // namespace media
 
 #endif  // MEDIA_FFMPEG_FFMPEG_COMMON_H_