VAVDA: properly mark outputted pictures.

content/common/gpu/media/vaapi_h264_decoder.cc

Index: content/common/gpu/media/vaapi_h264_decoder.cc
diff --git a/content/common/gpu/media/vaapi_h264_decoder.cc b/content/common/gpu/media/vaapi_h264_decoder.cc
index 0d8643e9de2f8612911de9c725489efa1da86308..b459ebbcc0e1864e59a793f63099f1f8b6df4aa5 100644
--- a/content/common/gpu/media/vaapi_h264_decoder.cc
+++ b/content/common/gpu/media/vaapi_h264_decoder.cc
@@ -1506,6 +1506,8 @@ bool VaapiH264Decoder::OutputPic(H264Picture* pic) {
   // No longer need to keep POC->surface mapping, since for decoder this POC
   // is finished with. When the client returns this surface via
   // ReusePictureBuffer(), it will be marked back as available for use.
+  DCHECK(!pic->outputted);
+  pic->outputted = true;
   DecodeSurface* dec_surface = UnassignSurfaceFromPoC(pic->pic_order_cnt);
   if (!dec_surface)
     return false;