predictors: Add the request priority to the reource_prefetch_predictor DB.

chrome/browser/net/resource_prefetch_predictor_observer.cc

Index: chrome/browser/net/resource_prefetch_predictor_observer.cc
diff --git a/chrome/browser/net/resource_prefetch_predictor_observer.cc b/chrome/browser/net/resource_prefetch_predictor_observer.cc
index 81d9b07ff98f3ddeee536cdbf1f3eecb45b314b5..ebcba2b7ccec9b976cac3b962394fb98c158b9bb 100644
--- a/chrome/browser/net/resource_prefetch_predictor_observer.cc
+++ b/chrome/browser/net/resource_prefetch_predictor_observer.cc
@@ -72,6 +72,7 @@ bool SummarizeResponse(net::URLRequest* request,
   summary->navigation_id.creation_time = request->creation_time();
   summary->resource_url = request->original_url();
   summary->resource_type = info->GetResourceType();
+  summary->priority = request->priority();
   request->GetMimeType(&summary->mime_type);
   summary->was_cached = request->was_cached();