Add UMA metrics for ffmpeg color ranges.

media/ffmpeg/ffmpeg_common.cc

Index: media/ffmpeg/ffmpeg_common.cc
diff --git a/media/ffmpeg/ffmpeg_common.cc b/media/ffmpeg/ffmpeg_common.cc
index 72b31252f8508df48cc10c7d2d832264525233cd..8f3d1de5c0573df9815f0d568ae2b19e167b473e 100644
--- a/media/ffmpeg/ffmpeg_common.cc
+++ b/media/ffmpeg/ffmpeg_common.cc
@@ -6,6 +6,7 @@
 
 #include "base/basictypes.h"
 #include "base/logging.h"
+#include "base/metrics/histogram.h"
 #include "media/base/decoder_buffer.h"
 #include "media/base/video_frame.h"
 #include "media/base/video_util.h"
@@ -369,6 +370,12 @@ void AVStreamToVideoDecoderConfig(
   gfx::Size natural_size = GetNaturalSize(
       visible_rect.size(), aspect_ratio.num, aspect_ratio.den);
 
+  if (record_stats) {
+    UMA_HISTOGRAM_ENUMERATION("Media.VideoColorRange",
+                              stream->codec->color_range,
+                              AVCOL_RANGE_NB + 1);

[scherkus (not reviewing), 2013/10/29 00:36:31]

should this be AVCOL_RANGE_NB as opposed to AVCOL_RANGE_NB + 1?

IIUC, AVCOL_RANGE_NB is equivalent to your FORMAT_MAX and not actually a valid
value

+  }
+
   VideoFrame::Format format = PixelFormatToVideoFormat(stream->codec->pix_fmt);
   if (codec == kCodecVP9) {
     // TODO(tomfinegan): libavcodec doesn't know about VP9.