Gallery.app: make edit button toggleable.

ui/file_manager/gallery/js/slide_mode.js

Index: ui/file_manager/gallery/js/slide_mode.js
diff --git a/ui/file_manager/gallery/js/slide_mode.js b/ui/file_manager/gallery/js/slide_mode.js
index 3b8137648aea94f4fe20b11b6f2d7e2702f9fdac..64a0537abc219c0ce0ae6dad444494044ea06136 100644
--- a/ui/file_manager/gallery/js/slide_mode.js
+++ b/ui/file_manager/gallery/js/slide_mode.js
@@ -363,6 +363,13 @@ function SlideMode(container, content, topToolbar, bottomToolbar, prompt,
   this.editButton_.addEventListener('click', this.toggleEditor.bind(this));
 
   /**
+   * @private {!FilesToggleRipple}
+   * @const
+   */
+  this.editButtonToggleRipple_ = /** @type {!FilesToggleRipple} */
+      (assert(this.editButton_.querySelector('files-toggle-ripple')));
+
+  /**
    * @type {!HTMLElement}
    * @private
    * @const
@@ -1524,6 +1531,7 @@ SlideMode.prototype.toggleEditor = function(opt_event) {
   this.stopSlideshow_();
 
   ImageUtil.setAttribute(this.container_, 'editing', !this.isEditing());
+  this.editButtonToggleRipple_.activated = this.isEditing();
 
   if (this.isEditing()) { // isEditing has just been flipped to a new value.
     // Reset zoom.