Add histogram entry for GpuVideoDecoder errors.

media/filters/gpu_video_decoder.cc

Index: media/filters/gpu_video_decoder.cc
diff --git a/media/filters/gpu_video_decoder.cc b/media/filters/gpu_video_decoder.cc
index 6100bdc09e1b839cd3db14ffd2b7510ed4e134ad..f09c5da3fb4e05fb63667af97f98c24fd203af60 100644
--- a/media/filters/gpu_video_decoder.cc
+++ b/media/filters/gpu_video_decoder.cc
@@ -704,6 +704,9 @@ void GpuVideoDecoder::NotifyError(media::VideoDecodeAccelerator::Error error) {
   }
 
   DLOG(ERROR) << "VDA Error: " << error;
+  UMA_HISTOGRAM_ENUMERATION("Media.GpuVideoDecoderError", error,
+                            media::VideoDecodeAccelerator::ERROR_MAX + 1);
+
   DestroyVDA();
 }