media: Send chrome-cache: frfr on first request.

media/blink/url_index.cc

Index: media/blink/url_index.cc
diff --git a/media/blink/url_index.cc b/media/blink/url_index.cc
index c0f1428ce8397ba632c2cac2f25b0dc1fcf1f001..f255cb19f686e21499392dfa6e5d6528e74c83fa 100644
--- a/media/blink/url_index.cc
+++ b/media/blink/url_index.cc
@@ -80,6 +80,7 @@ void UrlData::MergeFrom(const scoped_refptr<UrlData>& other) {
     if (last_modified_.is_null()) {
       last_modified_ = other->last_modified_;
     }
+    bytes_read_from_cache_ += other->bytes_read_from_cache_;
     multibuffer()->MergeFrom(other->multibuffer());
   }
 }