[APPS] Add content security policy to the ChromeOS video player app.

The Video Player app has a test, VideoPlayerBrowserTest.OpenSingleVideoOnDrive, that loads a script from ui/file_manager/integration_tests. This script would normally be blocked by the platform app's CSP. Update the app to use an explicit CSP allowing the extension's resource.

Bug: 861815
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: Idf10b0eea4e284ea4c3f0c624dc05c5a340fc4ed
Reviewed-on: https://chromium-review.googlesource.com/1132314
Commit-Queue: David Bertoni <dbertoni@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574167}

ui/file_manager/video_player/manifest.json

@@ -67,6 +67,7 @@
       ]
     },
     // enhhojjnijigcajfphajepfemndkmdlo is the Media Router component extension ID.
-    "content_security_policy": "default-src 'none'; script-src 'self' blob: filesystem: chrome://resources chrome-extension://hhaomjibdihmijegdhdafkllkbggdgoj chrome-extension://enhhojjnijigcajfphajepfemndkmdlo; style-src 'self' blob: filesystem: chrome://resources 'unsafe-inline'; img-src 'self' blob: filesystem: chrome://theme chrome://resources data: https://www.googledrive.com; media-src 'self' blob: filesystem:; object-src 'self' blob: filesystem:; font-src chrome://resources;"
+    // ljoplibgfehghmibaoaepfagnmbbfiga is the ui/file_manager/integration_tests component extension ID.
+    "content_security_policy": "default-src 'none'; script-src 'self' blob: filesystem: chrome://resources chrome-extension://hhaomjibdihmijegdhdafkllkbggdgoj chrome-extension://enhhojjnijigcajfphajepfemndkmdlo chrome-extension://ljoplibgfehghmibaoaepfagnmbbfiga; style-src 'self' blob: filesystem: chrome://resources 'unsafe-inline'; img-src 'self' blob: filesystem: chrome://theme chrome://resources data: https://www.googledrive.com; media-src 'self' blob: filesystem:; object-src 'self' blob: filesystem:; font-src chrome://resources;"
   }
 }