Record the parallel download UMA for fresh new downloads

content/browser/download/download_item_impl.cc

Index: content/browser/download/download_item_impl.cc
diff --git a/content/browser/download/download_item_impl.cc b/content/browser/download/download_item_impl.cc
index fb6ff4a01339ddf4acc7ed3bbd155e1603e2a7e6..b98c965971173844a132d42b7e4cd45f965fdff3 100644
--- a/content/browser/download/download_item_impl.cc
+++ b/content/browser/download/download_item_impl.cc
@@ -1265,6 +1265,8 @@ void DownloadItemImpl::Start(
 
   if (state_ == INITIAL_INTERNAL) {
     RecordDownloadCount(NEW_DOWNLOAD_COUNT);
+    if (job_->UsesParallelRequests())
+      RecordParallelDownloadCount(NEW_DOWNLOAD_COUNT);
     RecordDownloadMimeType(mime_type_);
     if (!GetBrowserContext()->IsOffTheRecord()) {
       RecordDownloadCount(NEW_DOWNLOAD_COUNT_NORMAL_PROFILE);