Add UMA stats for audio/video containers.

media/base/container_names.h

Index: media/base/container_names.h
diff --git a/media/base/container_names.h b/media/base/container_names.h
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+++ b/media/base/container_names.h
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+// Copyright (c) 2013 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_BASE_CONTAINER_NAMES_H_
+#define MEDIA_BASE_CONTAINER_NAMES_H_
+
+#include "base/basictypes.h"
+
+namespace media {
+
+namespace container_names {
+
+// This is the set of input container formats detected for logging purposes. Not
+// all of these are enabled (and it varies by product). Any additions need to be
+// done at the end of the list (before CONTAINER_MAX). This list must be kept in
+// sync with the enum definition "MediaContainers" in
+// tools/metrics/histograms/histograms.xml.
+enum MediaContainerName {
+  CONTAINER_UNKNOWN,          // Unknown
+  CONTAINER_AAC,              // AAC (Advanced Audio Coding)
+  CONTAINER_AC3,              // AC-3
+  CONTAINER_AIFF,             // AIFF (Audio Interchange File Format)
+  CONTAINER_AMR,              // AMR (Adaptive Multi-Rate Audio)
+  CONTAINER_APE,              // APE (Monkey's Audio)
+  CONTAINER_ASF,              // ASF (Advanced / Active Streaming Format)
+  CONTAINER_ASS,              // SSA (SubStation Alpha) subtitle
+  CONTAINER_AVI,              // AVI (Audio Video Interleaved)
+  CONTAINER_BINK,             // Bink
+  CONTAINER_CAF,              // CAF (Apple Core Audio Format)
+  CONTAINER_DTS,              // DTS
+  CONTAINER_DTSHD,            // DTS-HD
+  CONTAINER_DV,               // DV (Digital Video)
+  CONTAINER_DXA,              // DXA
+  CONTAINER_EAC3,             // Enhanced AC-3
+  CONTAINER_FLAC,             // FLAC (Free Lossless Audio Codec)
+  CONTAINER_FLV,              // FLV (Flash Video)
+  CONTAINER_GSM,              // GSM (Global System for Mobile Audio)
+  CONTAINER_H261,             // H.261
+  CONTAINER_H263,             // H.263
+  CONTAINER_H264,             // H.264
+  CONTAINER_HLS,              // HLS (Apple HTTP Live Streaming PlayList)
+  CONTAINER_IRCAM,            // Berkeley/IRCAM/CARL Sound Format
+  CONTAINER_MJPEG,            // MJPEG video
+  CONTAINER_MOV,              // QuickTime / MOV / MPEG4
+  CONTAINER_MP3,              // MP3 (MPEG audio layer 2/3)
+  CONTAINER_MPEG2PS,          // MPEG-2 Program Stream
+  CONTAINER_MPEG2TS,          // MPEG-2 Transport Stream
+  CONTAINER_MPEG4BS,          // MPEG-4 Bitstream
+  CONTAINER_OGG,              // Ogg
+  CONTAINER_RM,               // RM (RealMedia)
+  CONTAINER_SRT,              // SRT (SubRip subtitle)
+  CONTAINER_SWF,              // SWF (ShockWave Flash)
+  CONTAINER_VC1,              // VC-1
+  CONTAINER_WAV,              // WAV / WAVE (Waveform Audio)
+  CONTAINER_WEBM,             // Matroska / WebM
+  CONTAINER_WTV,              // WTV (Windows Television)
+  CONTAINER_MAX               // Must be last
+};
+
+// Determine the container type.
+MediaContainerName DetermineContainer(const uint8* buffer, int buffer_size);
+
+}  // namespace container_names
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_CONTAINER_NAMES_H_