Disable zip selection on MTP volume.

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 4dd71e8dcacef6e640c32dcbc05fa3bdd406270a..5a658a5215a743ae934a3ac2f110ac5077c4fd5e 100644
--- a/ui/file_manager/file_manager/foreground/js/directory_model.js
+++ b/ui/file_manager/file_manager/foreground/js/directory_model.js
@@ -179,13 +179,29 @@ DirectoryModel.prototype.isSearching = function() {
 };
 
 /**
- * @return {boolean}
+ * @return {boolean} True if it's on Drive.
  */
 DirectoryModel.prototype.isOnDrive = function() {
+  return this.isCurrentRootVolumeType_(VolumeManagerCommon.VolumeType.DRIVE);
+};
+
+/**
+ * @return {boolean} True if it's on MTP volume.
+ */
+DirectoryModel.prototype.isOnMTP = function() {
+  return this.isCurrentRootVolumeType_(VolumeManagerCommon.VolumeType.MTP);
+};
+
+/**
+ * @param {VolumeManagerCommon.VolumeType} volumeType Volume Type
+ * @return {boolean} True if current root volume type is equal to specified
+ *     volume type.
+ * @private
+ */
+DirectoryModel.prototype.isCurrentRootVolumeType_ = function(volumeType) {
   var rootType = this.getCurrentRootType();
   return rootType != null &&
-      VolumeManagerCommon.getVolumeTypeFromRootType(rootType) ==
-      VolumeManagerCommon.VolumeType.DRIVE;
+      VolumeManagerCommon.getVolumeTypeFromRootType(rootType) === volumeType;
 };
 
 /**