Dispatch directory-changed event before rescan starts.

ui/file_manager/file_manager/foreground/js/directory_model.js

Index: ui/file_manager/file_manager/foreground/js/directory_model.js
diff --git a/ui/file_manager/file_manager/foreground/js/directory_model.js b/ui/file_manager/file_manager/foreground/js/directory_model.js
index 1bb990a71e9a11abbb112bce566e571befe92efe..20ef2123a377aa7f761057367c90214c6b9498a9 100644
--- a/ui/file_manager/file_manager/foreground/js/directory_model.js
+++ b/ui/file_manager/file_manager/foreground/js/directory_model.js
@@ -919,6 +919,18 @@ DirectoryModel.prototype.changeDirectoryEntry = function(
 
           var previousDirEntry =
               this.currentDirContents_.getDirectoryEntry();
+          var previousVolumeInfo =
+              previousDirEntry ?
+              this.volumeManager_.getVolumeInfo(previousDirEntry) : null;
+
+          // VolumeInfo for dirEntry.
+          var currentVolumeInfo = this.getCurrentVolumeInfo();
+          var event = new Event('directory-changed');
+          event.previousDirEntry = previousDirEntry;
+          event.newDirEntry = dirEntry;
+          event.volumeChanged = previousVolumeInfo !== currentVolumeInfo;
+          this.dispatchEvent(event);
+
           this.clearAndScan_(
               newDirectoryContents,
               function(result) {
@@ -934,16 +946,6 @@ DirectoryModel.prototype.changeDirectoryEntry = function(
           // For tests that open the dialog to empty directories, everything
           // is loaded at this point.
           util.testSendMessage('directory-change-complete');
-          var previousVolumeInfo =
-              previousDirEntry ?
-              this.volumeManager_.getVolumeInfo(previousDirEntry) : null;
-          // VolumeInfo for dirEntry.
-          var currentVolumeInfo = this.getCurrentVolumeInfo();
-          var event = new Event('directory-changed');
-          event.previousDirEntry = previousDirEntry;
-          event.newDirEntry = dirEntry;
-          event.volumeChanged = previousVolumeInfo !== currentVolumeInfo;
-          this.dispatchEvent(event);
         }.bind(this));
   }.bind(this, this.changeDirectorySequence_));
 };