Better error handling for FFmpegDemuxer seeking

media/filters/ffmpeg_demuxer.cc

Index: media/filters/ffmpeg_demuxer.cc
diff --git a/media/filters/ffmpeg_demuxer.cc b/media/filters/ffmpeg_demuxer.cc
index 081bcbf1a452be23ee45adb6a080e11bd5b55c77..5b7010786aacb32b99eb7f6dfd9889f511f1d9c9 100644
--- a/media/filters/ffmpeg_demuxer.cc
+++ b/media/filters/ffmpeg_demuxer.cc
@@ -1649,10 +1649,10 @@ void FFmpegDemuxer::OnSeekFrameDone(int result) {
   }
 
   if (result < 0) {
-    // Use VLOG(1) instead of NOTIMPLEMENTED() to prevent the message being
-    // captured from stdout and contaminates testing.
-    // TODO(scherkus): Implement this properly and signal error (BUG=23447).
-    VLOG(1) << "Not implemented";
+    MEDIA_LOG(ERROR, media_log_)
+        << GetDisplayName() << ": seek failed: " << AVErrorToString(result);
+    base::ResetAndReturn(&pending_seek_cb_).Run(PIPELINE_ERROR_ABORT);
+    return;
   }
 
   // Tell streams to flush buffers due to seeking.