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

chrome/browser/resources/file_manager/common/js/util.js

Index: chrome/browser/resources/file_manager/common/js/util.js
diff --git a/chrome/browser/resources/file_manager/common/js/util.js b/chrome/browser/resources/file_manager/common/js/util.js
index afc29fabf76880fe322c7b0836f3eddb53122fc5..c057c6f60e52f586ec9714c38060a34b328828f8 100644
--- a/chrome/browser/resources/file_manager/common/js/util.js
+++ b/chrome/browser/resources/file_manager/common/js/util.js
@@ -1148,11 +1148,12 @@ util.entriesToURLs = function(entries) {
  * Converts array of URLs to an array of corresponding Entries.
  *
  * @param {Array.<string>} urls Input array of URLs.
- * @param {function(Array.<Entry>)} callback Completion callback with array of
- *     Entries.
+ * @param {function(Array.<Entry>, Array.<URL>)} callback Completion callback
+ *     with array of success Entries and failure URLs.
  */
 util.URLsToEntries = function(urls, callback) {
   var result = [];
+  var failureUrl = [];
   AsyncUtil.forEach(
       urls,
       function(forEachCallback, url) {
@@ -1162,12 +1163,11 @@ util.URLsToEntries = function(urls, callback) {
         }, function() {
           // Not an error. Possibly, the file is not accessible anymore.
           console.warn('Failed to resolve the file with url: ' + url + '.');
+          failureUrl.push(url);
           forEachCallback();
         });
       },
-      function() {
-        callback(result);
-      });
+      callback.bind(null, result, failureUrl));
 };
 
 /**