Update progress center immediately when files are pasted.

URLsToEntriesWithAccess is heavy operation especially on slow storage
devices such as MTP connected ones.
Previously, progress center was updated only after
URLsToEntriesWithAccess was finished. As a result, it took more than 30
seconds for a user to receive feedback in some cases.

BUG=712547
TEST=manually tested.
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2846763002
Cr-Commit-Position: refs/heads/master@{#467840}

ui/file_manager/file_manager/foreground/js/file_transfer_controller.js

@@ -548,6 +548,15 @@ FileTransferController.prototype.paste =
   var shareEntries;
   var taskId = this.fileOperationManager_.generateTaskId();
 
+  var item = new ProgressCenterItem();
+  item.id = taskId;
+  if (toMove) {
+    item.message = strf('MOVE_ITEMS_REMAINING', sourceURLs.length);
+  } else {
+    item.message = strf('COPY_ITEMS_REMAINING', sourceURLs.length);
+  }
+  this.progressCenter_.updateItem(item);
+
   FileTransferController.URLsToEntriesWithAccess(sourceURLs)
       .then(
           /**