Plumb ConnectionAttempts from HttpNetworkTransaction to URLRequest.

net/url_request/url_request.cc

Index: net/url_request/url_request.cc
diff --git a/net/url_request/url_request.cc b/net/url_request/url_request.cc
index de525603b5bfea255d7bd6fd976b015efdc34add..5c08c81e374d2daf3a380bf11d07397f83ec58f0 100644
--- a/net/url_request/url_request.cc
+++ b/net/url_request/url_request.cc
@@ -1189,4 +1189,11 @@ const base::debug::StackTrace* URLRequest::stack_trace() const {
   return stack_trace_.get();
 }
 
+void URLRequest::GetConnectionAttempts(ConnectionAttempts* out) const {
+  if (job_)
+    job_->GetConnectionAttempts(out);
+  else
+    out->clear();
+}
+
 }  // namespace net