Gallery: Add support for Media Keys

ui/file_manager/gallery/js/gallery.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.
 
 'use strict';
 
 /**
  * Called from the main frame when unloading.
  * @param {boolean=} opt_exiting True if the app is exiting.
  */
@@ skipping 672 matching lines @@
     case 'U+0008': // Backspace.
       // The default handler would call history.back and close the Gallery.
       event.preventDefault();
       break;
 
     case 'U+004D':  // 'm' switches between Slide and Mosaic mode.
       this.toggleMode_(null, event);
       break;
 
     case 'U+0056':  // 'v'
+    case 'MediaPlayPause':
       this.slideMode_.startSlideshow(SlideMode.SLIDESHOW_INTERVAL_FIRST, event);
       break;
 
     case 'U+007F':  // Delete
     case 'Shift-U+0033':  // Shift+'3' (Delete key might be missing).
     case 'U+0044':  // 'd'
       this.delete_();
       break;
   }
 };
@@ skipping 261 matching lines @@
   window.loadTimeData.data = backgroundComponents.stringData;
   gallery = new Gallery(backgroundComponents.volumeManager);
 };
 
 /**
  * Loads entries.
  */
 window.loadEntries = function(entries, selectedEntries) {
   gallery.load(entries, selectedEntries);
 };