Compile more Gallery targets in gyp v2.

ui/file_manager/gallery/js/gallery_scripts.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // The include directives are put into Javascript-style comments to prevent
 // parsing errors in non-flattened mode. The flattener still sees them.
 // Note that this makes the flattener to comment out the first line of the
 // included file but that's all right since any javascript file should start
 // with a copyright comment anyway.
 
@@ skipping 50 matching lines @@
 // <include src="../../file_manager/foreground/js/ui/files_confirm_dialog.js">
 // <include src="../../file_manager/foreground/js/ui/share_dialog.js">
 // <include src="../../file_manager/foreground/js/volume_manager_wrapper.js">
 
 // <include src="image_editor/image_util.js">
 // <include src="image_editor/viewport.js">
 // <include src="image_editor/image_buffer.js">
 // <include src="image_editor/image_loader.js">
 // <include src="image_editor/image_view.js">
 // <include src="image_editor/commands.js">
+// <include src="image_editor/image_editor_prompt.js">
 // <include src="image_editor/image_editor.js">
 // <include src="image_editor/image_transform.js">
 // <include src="image_editor/image_adjust.js">
 // <include src="image_editor/image_resize.js">
 // <include src="image_editor/filter.js">
 // <include src="image_editor/image_encoder.js">
 // <include src="image_editor/exif_encoder.js">
 
 // <include src="dimmable_ui_controller.js">
 // <include src="entry_list_watcher.js">
 // <include src="error_banner.js">
 // <include src="gallery_constants.js">
 // <include src="gallery_data_model.js">
 // <include src="gallery_item.js">
 // <include src="gallery_util.js">
 // <include src="ribbon.js">
 // <include src="slide_mode.js">
 // <include src="thumbnail_mode.js">
 // <include src="gallery.js">
 
 // Exports
 window.ImageUtil = ImageUtil;
 window.metrics = metrics;
 window.Gallery = Gallery;
 
 window.reload = reload;  // will be called by the background.
 window.gallery = gallery;  // for debug.
 
 })();