Gallery.app: Add buttons to the cropping mode to specifying the aspect ratio.

ui/file_manager/gallery/js/image_editor/image_editor.js

Index: ui/file_manager/gallery/js/image_editor/image_editor.js
diff --git a/ui/file_manager/gallery/js/image_editor/image_editor.js b/ui/file_manager/gallery/js/image_editor/image_editor.js
index faef0d950bf048998c0afa57fd3be6a2ec261b8d..b85832fb5675e1d571e9854eeae692f74bf9c1ef 100644
--- a/ui/file_manager/gallery/js/image_editor/image_editor.js
+++ b/ui/file_manager/gallery/js/image_editor/image_editor.js
@@ -901,6 +901,13 @@ ImageEditor.Toolbar = function(parent, displayStringFunction, updateCallback) {
   this.wrapper_ = parent;
   this.displayStringFunction_ = displayStringFunction;
   this.updateCallback_ = updateCallback;
+  Object.seal(this);
+};
+
+ImageEditor.Toolbar.prototype = {
+  get element() {
+    return this.wrapper_;
+  }
 };
 
 /**
@@ -953,7 +960,8 @@ ImageEditor.Toolbar.prototype.addLabel = function(name) {
 ImageEditor.Toolbar.prototype.addButton = function(
     name, title, handler, opt_class) {
   var button = this.create_('button');
-  if (opt_class) button.classList.add(opt_class);
+  if (opt_class)
+    button.classList.add(opt_class);
   var label = this.create_('span');
   label.textContent = this.displayStringFunction_(title);
   button.appendChild(label);