Add PermissionDescriptor to the permissions Mojo interface.

third_party/WebKit/Source/modules/modules.gypi

 {
   'includes': [
     '../core/core_generated.gypi',
     'modules_generated.gypi',
   ],
   'variables': {
     # Experimental hooks for embedder to provide extra IDL and source files.
     #
     # Note: this is not a supported API. If you rely on this, you will be broken
     # from time to time as the code generator changes in backward incompatible
@@ skipping 867 matching lines @@
       'peerconnection/RTCVoidRequestImpl.cpp',
       'peerconnection/RTCVoidRequestImpl.h',
       'peerconnection/RTCVoidRequestPromiseImpl.cpp',
       'peerconnection/RTCVoidRequestPromiseImpl.h',
       'permissions/NavigatorPermissions.cpp',
       'permissions/NavigatorPermissions.h',
       'permissions/Permissions.cpp',
       'permissions/Permissions.h',
       'permissions/PermissionStatus.cpp',
       'permissions/PermissionStatus.h',
+      'permissions/PermissionUtils.cpp',
+      'permissions/PermissionUtils.h',
       'permissions/WorkerNavigatorPermissions.cpp',
       'permissions/WorkerNavigatorPermissions.h',
       'plugins/DOMMimeType.cpp',
       'plugins/DOMMimeType.h',
       'plugins/DOMMimeTypeArray.cpp',
       'plugins/DOMMimeTypeArray.h',
       'plugins/DOMPlugin.cpp',
       'plugins/DOMPlugin.h',
       'plugins/DOMPluginArray.cpp',
       'plugins/DOMPluginArray.h',
@@ skipping 87 matching lines @@
       'screen_orientation/ScreenOrientation.cpp',
       'screen_orientation/ScreenOrientation.h',
       'screen_orientation/ScreenOrientationController.cpp',
       'screen_orientation/ScreenOrientationController.h',
       'screen_orientation/ScreenOrientationDispatcher.cpp',
       'screen_orientation/ScreenOrientationDispatcher.h',
     ],
     # 'partial interface' or target (right side of) 'implements'
   },
 }