[files-progress] Add util function to check transfer details flag.

Bug: 953308
Change-Id: Id81ab64bb319cc6be2e9aae2dbdb6bf1a04550c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2306491
Commit-Queue: Omid Tourzan <oto@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790019}

ui/file_manager/file_manager/common/js/util.js

@@ -1417,6 +1417,14 @@ util.isZipNoNacl = () => {
   return loadTimeData.getBoolean('ZIP_NO_NACL');
 };
 
+/**
+ * Returns true if transfer details flag is enabled.
+ * @return {boolean}
+ */
+util.isTransferDetailsEnabled = () => {
+  return loadTimeData.getBoolean('FILES_TRANSFER_DETAILS_ENABLED');
+};
+
 /**
  * Retrieves all entries inside the given |rootEntry|.
  * @param {!DirectoryEntry} rootEntry