Dropping files into the root list.

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

Index: chrome/browser/resources/file_manager/js/file_manager.js
diff --git a/chrome/browser/resources/file_manager/js/file_manager.js b/chrome/browser/resources/file_manager/js/file_manager.js
index 3a35ebbca9b4a9e14f399ee99cbbf360ffd328b5..7eed72dc779a2db99642464c95c567af956fc21c 100644
--- a/chrome/browser/resources/file_manager/js/file_manager.js
+++ b/chrome/browser/resources/file_manager/js/file_manager.js
@@ -519,8 +519,6 @@ FileManager.prototype = {
        return self.getMetadataProvider().isInitialized();
     });
 
-    this.directoryModel_.setOffline(this.isOffline());
-
     if (this.dialogType_ == FileManager.DialogType.FULL_PAGE)
       this.initDataTransferOperations_();
 
@@ -548,6 +546,7 @@ FileManager.prototype = {
     controller.attachDropTarget(this.table_.list);
     controller.attachDragSource(this.grid_);
     controller.attachDropTarget(this.grid_);
+    controller.attachDropTarget(this.rootsList_, true);
     controller.attachCopyPasteHandlers(this.document_);
     controller.addEventListener('selection-copied',
         this.blinkSelection.bind(this));
@@ -2615,7 +2614,6 @@ FileManager.prototype = {
       console.log('ONLINE');
       this.dialogContainer_.removeAttribute('offline');
     }
-    this.directoryModel_.setOffline(this.isOffline());
   };
 
   FileManager.prototype.isOnGDataOffline = function() {