[File Manager] Properly enable/disable Copy and Open for GData files in the offline mode.

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

Index: chrome/browser/resources/file_manager/js/file_transfer_controller.js
diff --git a/chrome/browser/resources/file_manager/js/file_transfer_controller.js b/chrome/browser/resources/file_manager/js/file_transfer_controller.js
index e81219931c4697431d83422b01574a33d8aa0fed..25f14ef7c771997bddae1788d965c17771935cb6 100644
--- a/chrome/browser/resources/file_manager/js/file_transfer_controller.js
+++ b/chrome/browser/resources/file_manager/js/file_transfer_controller.js
@@ -8,12 +8,14 @@ function FileTransferController(fileList,
                                 fileListSelection,
                                 dragNodeConstructor,
                                 copyManager,
-                                directoryModel) {
+                                directoryModel,
+                                commands) {
   this.fileList_ = fileList;
   this.fileListSelection_ = fileListSelection;
   this.dragNodeConstructor_ = dragNodeConstructor;
   this.copyManager_ = copyManager;
   this.directoryModel_ = directoryModel;
+  this.commands_ = commands;
 
   this.fileListSelection_.addEventListener('change',
       this.onSelectionChanged_.bind(this));
@@ -78,7 +80,7 @@ FileTransferController.prototype = {
    *     |dataTransfer.effectAllowed| property ('move', 'copy', 'copyMove').
    */
   cutOrCopy: function(dataTransfer, effectAllowed) {
-    var directories  = [];
+    var directories = [];
     var files = [];
     var entries = this.selectedEntries_;
     for (var i = 0; i < entries.length; i++) {
@@ -254,6 +256,10 @@ FileTransferController.prototype = {
   },
 
   canCopyOrDrag_: function() {
+    if (this.isOnGData &&
+        this.directoryModel_.offline &&
+        !this.allGDataFilesAvailable)
+      return false;
     return this.selectedEntries_.length > 0;
   },
 
@@ -371,6 +377,17 @@ FileTransferController.prototype = {
       if (dragNodes.length < MAX_DRAG_THUMBAIL_COUNT)
         dragNodes.push(new this.dragNodeConstructor_(entries[i]));
     }
+
+    if (this.isOnGData) {
+      this.allGDataFilesAvailable = false;
+      var urls = entries.map(function(e) { return e.toURL() });
+      FileType.checkOfflineAvailability(entries, urls, function(result) {
+        this.allGDataFilesAvailable = result;
+        // |Copy| is the only menu item affected by allGDataFilesAvailable.
+        // It could be open right now, update its UI.
+        this.commands_['copy'].disabled = !this.canCopyOrDrag_();
+      }.bind(this));
+    }
   },
 
   get currentDirectory() {
@@ -382,7 +399,7 @@ FileTransferController.prototype = {
   },
 
   get isOnGData() {
-    return this.directoryModel_.rootType == DirectoryModel.RootType.GDATA;
+    return this.directoryModel_.isOnGData;
   },
 
   notify_: function(eventName) {