feat(tile-view): persist setting in local storage (#3379)

* feat(tile-view): persist setting in local storage

* comment

react/features/video-layout/functions.js

         state['features/video-layout']
             && state['features/video-layout'].tileViewEnabled
             && !state['features/etherpad'].editing
+
+            // Truthy check is needed for interfaceConfig to prevent errors on
+            // mobile which does not have interfaceConfig. On web, tile view
+            // should never be enabled for filmstrip only mode.
+            && (typeof interfaceConfig === 'undefined'
+                || !interfaceConfig.filmStripOnly)
     );
 }

react/features/video-layout/reducer.js

 // @flow
 
 import { ReducerRegistry } from '../base/redux';
+import { PersistenceRegistry } from '../base/storage';
 
 import { SET_TILE_VIEW } from './actionTypes';
 
-ReducerRegistry.register('features/video-layout', (state = {}, action) => {
+const STORE_NAME = 'features/video-layout';
+
+PersistenceRegistry.register(STORE_NAME);
+
+ReducerRegistry.register(STORE_NAME, (state = {}, action) => {
     switch (action.type) {
     case SET_TILE_VIEW:
         return {