Add new UMA stats for parallelizable download

content/browser/download/parallel_download_utils.h

Index: content/browser/download/parallel_download_utils.h
diff --git a/content/browser/download/parallel_download_utils.h b/content/browser/download/parallel_download_utils.h
index 3c65a84a955e0ec4fbb290cf3b70c6b938b9b67d..c6031f50ff83a6de24ea0ce1b169d773be04c617 100644
--- a/content/browser/download/parallel_download_utils.h
+++ b/content/browser/download/parallel_download_utils.h
@@ -62,6 +62,10 @@ CONTENT_EXPORT void DebugSlicesInfo(const DownloadItem::ReceivedSlices& slices);
 // 0, return 0.
 CONTENT_EXPORT int64_t GetMaxContiguousDataBlockSizeFromBeginning(
     const DownloadItem::ReceivedSlices& slices);
+
+// Returns whether parallel download is enabled.
+CONTENT_EXPORT bool IsParallelDownloadEnabled();
+
 }  //  namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_PARALLEL_DOWNLOAD_UTILS_H_