Vp8Parser: Zero-initialize segment feature data when required

media/filters/vp8_parser.cc

Index: media/filters/vp8_parser.cc
diff --git a/media/filters/vp8_parser.cc b/media/filters/vp8_parser.cc
index 008847880b9dafc486ab784f203ee4207c637d70..54b0c4294ea04d0ae1561f35aa443cb59f290ef8 100644
--- a/media/filters/vp8_parser.cc
+++ b/media/filters/vp8_parser.cc
@@ -242,6 +242,8 @@ bool Vp8Parser::ParseSegmentationHeader(bool keyframe) {
       BD_READ_BOOL_OR_RETURN(&quantizer_update);
       if (quantizer_update)
         BD_READ_SIGNED_OR_RETURN(7, &shdr->quantizer_update_value[i]);
+      else
+        shdr->quantizer_update_value[i] = 0;
     }
 
     for (size_t i = 0; i < kMaxMBSegments; ++i) {
@@ -249,6 +251,8 @@ bool Vp8Parser::ParseSegmentationHeader(bool keyframe) {
       BD_READ_BOOL_OR_RETURN(&loop_filter_update);
       if (loop_filter_update)
         BD_READ_SIGNED_OR_RETURN(6, &shdr->lf_update_value[i]);
+      else
+        shdr->lf_update_value[i] = 0;
     }
   }