Files.app: Show error messages for the case the source file is not exists.

chrome/browser/resources/file_manager/foreground/js/file_manager.js

 // Copyright (c) 2012 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.
 
 'use strict';
 
 /**
  * FileManager constructor.
  *
  * FileManager objects encapsulate the functionality of the file selector
@@ skipping 381 matching lines @@
     controller.attachFileListDropTarget(this.table_.list);
     controller.attachDragSource(this.grid_);
     controller.attachFileListDropTarget(this.grid_);
     controller.attachTreeDropTarget(this.directoryTree_);
     controller.attachNavigationListDropTarget(this.navigationList_, true);
     controller.attachCopyPasteHandlers();
     controller.addEventListener('selection-copied',
         this.blinkSelection.bind(this));
     controller.addEventListener('selection-cut',
         this.blinkSelection.bind(this));
+    controller.addEventListener('source-not-found',
+        this.onSourceNotFound_.bind(this));
   };
 
   /**
+   * Handles an error that the source entry of file operation is not found.
+   * @private
+   */
+  FileManager.prototype.onSourceNotFound_ = function(event) {
+    // Ensure this.sourceNotFoundErrorCount_ is integer.
+    this.sourceNotFoundErrorCount_ = ~~this.sourceNotFoundErrorCount_;
+    var item = new ProgressCenterItem();
+    item.id = 'source-not-found-' + this.sourceNotFoundErrorCount_;
+    if (event.progressType === ProgressItemType.COPY)
+      item.message = strf('COPY_SOURCE_NOT_FOUND_ERROR', event.fileName);
+    else if (event.progressType === ProgressItemType.MOVE)
+      item.message = strf('MOVE_SOURCE_NOT_FOUND_ERROR', event.fileName);
+    item.state = ProgressItemState.ERROR;
+    this.backgroundPage_.background.progressCenter.updateItem(item);
+    this.sourceNotFoundErrorCount_++;
+  };
+
+  /**
    * One-time initialization of context menus.
    * @private
    */
   FileManager.prototype.initContextMenus_ = function() {
     this.fileContextMenu_ = this.dialogDom_.querySelector('#file-context-menu');
     cr.ui.Menu.decorate(this.fileContextMenu_);
 
     cr.ui.contextMenuHandler.setContextMenu(this.grid_, this.fileContextMenu_);
     cr.ui.contextMenuHandler.setContextMenu(this.table_.querySelector('.list'),
         this.fileContextMenu_);
@@ skipping 3281 matching lines @@
       callback(this.preferences_);
       return;
     }
 
     chrome.fileBrowserPrivate.getPreferences(function(prefs) {
       this.preferences_ = prefs;
       callback(prefs);
     }.bind(this));
   };
 })();