[VideoPlayer] Browser tests for new separated video player app

chrome/test/data/extensions/api_test/file_manager_browsertest/manifest.json

 {
   // chrome-extension://hoobinhbdbiehknkpbpejbbpdbkdjmoco/
   "key": "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDBjsTE4ocXJWzgcCDCUcsPASoRCGaTHrHn6b4zDTCayTuJtyGKzw4xZPMiG4dbEbmSAwEU7UCoyJAM1XfLS7UQ/Zz7ft8wpZkSS8/PJW+E4Qu++tMS0csj2Wdrrd2c5yyWxlJ+H9o2ivwtwuxs7pd+LXt+gsBA0epnT04T9EvOTQIDAQAB",
   "name": "chrome file manager browser tests",
   "version": "0.1",
   "incognito": "split",  // Run a separate instance for the incognito mode.
   "manifest_version": 2,
   "background": {
     "scripts": [
       // List background.js first because the testcase namespace is defined
       // here.
       "background.js",
       "drive_specific.js",
       "copy_between_windows.js",
       "execute_default_task.js",
       "file_display.js",
       "hide_search_box.js",
       "keyboard_operations.js",
       "multi_profile.js",
       "navigation_list.js",
       "open_special_types.js",
+      "open_video_files.js",
       "restore_geometry.js",
       "restore_prefs.js",
       "share_dialog.js",
       "suggest_app_dialog.js",
       "tab_index.js",
       "thumbnails.js",
       "transfer.js",
       "traverse.js"
     ]
   },
   "permissions": [
     "tabs",
     "chrome-extension://oobinhbdbiehknkpbpejbbpdbkdjmoco/*",
     "chrome-extension://hhaomjibdihmijegdhdafkllkbggdgoj/*"
   ]
 }