Files.app: Add a new column in table view to reflect cloud import status.

ui/file_manager/file_manager/foreground/css/file_manager.css

 /* Copyright (c) 2014 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file. */
 
 /* The order of z-index:
  * - -1: text-measure
  * - 2: drag-selection-border
  * - 3: preview-panel
  * - 500: scrollbar
  * - 500: splitter
@@ skipping 1097 matching lines @@
   height: 32px;
   line-height: 32px;
 }
 
 /* The icon in the name column. See file_types.css for specific icons. */
 .detail-icon {
   height: 24px;
   width: 24px;
 }
 
+.status-icon {
+  height: 24px;
+  width: 24px;
+}
+
 #detail-table .detail-icon {
   /* To shift the icon position. */
   margin-bottom: 2px;
 }
 
 .preview-panel .spacer {
   flex: auto;
 }
 
 #delete-button {
@@ skipping 735 matching lines @@
   visibility: hidden;
 }
 
 .text-measure {
   pointer-events: none;
   position: absolute;
   top: 0;
   visibility: hidden;
   z-index: -1;
 }