Gallery: capture escape key in full screen by adding a permission.

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 35a4301398d1ea5de95df3c017842315683d5d22..fd80c428bd7a99c15a2d02897ecd5b7352b5c695 100644
--- a/ui/file_manager/gallery/js/slide_mode.js
+++ b/ui/file_manager/gallery/js/slide_mode.js
@@ -203,7 +203,6 @@ function SlideMode(container, content, topToolbar, bottomToolbar, prompt,
    */
   this.spinnerTimer_ = null;
 
-  this.context_.appWindow.onRestored.addListener(this.onRestored_.bind(this));
   window.addEventListener('resize', this.onResize_.bind(this));
 
   // ----------------------------------------------------------------
@@ -1109,9 +1108,7 @@ SlideMode.prototype.onKeyDown = function(event) {
 
   if (this.isSlideshowOn_()) {
     switch (keyID) {
-      // Escape key is captured by the platform to exit full screen. We handle
-      // it by onRestored event.
-
+      case 'U+001B':  // Escape
       case 'MediaStop':
         this.stopSlideshow_(event);
         break;
@@ -1216,17 +1213,6 @@ SlideMode.prototype.onKeyDown = function(event) {
 };
 
 /**
- * Restored event handler.
- * @private
- */
-SlideMode.prototype.onRestored_ = function() {
-  // Leave slide show since the window should not be in full screen when
-  // onRestored event is dispatched.
-  if (this.isSlideshowOn_())
-    this.stopSlideshow_();
-};
-
-/**
  * Resize handler.
  * @private
  */