Add LB setting to new user settings

Put under labs out of concern for https://github.com/vector-im/riot-meta/issues/66

src/components/views/settings/tabs/user/LabsUserSettingsTab.js

@@ -53,6 +53,7 @@ export default class LabsUserSettingsTab extends React.Component {
                     {flags}
                     <SettingsFlag name={"enableWidgetScreenshots"} level={SettingLevel.ACCOUNT} />
                     <SettingsFlag name={"showHiddenEventsInTimeline"} level={SettingLevel.DEVICE} />
+                    <SettingsFlag name={"lowBandwidth"} level={SettingLevel.DEVICE} />
                 </div>
             </div>
         );

src/i18n/strings/en_EN.json

@@ -339,6 +339,7 @@
     "Show developer tools": "Show developer tools",
     "Order rooms in the room list by most important first instead of most recent": "Order rooms in the room list by most important first instead of most recent",
     "Show hidden events in timeline": "Show hidden events in timeline",
+    "Low bandwidth mode": "Low bandwidth mode",
     "Collecting app version information": "Collecting app version information",
     "Collecting logs": "Collecting logs",
     "Uploading report": "Uploading report",

src/settings/Settings.js

@@ -23,6 +23,7 @@ import {
 } from "./controllers/NotificationControllers";
 import CustomStatusController from "./controllers/CustomStatusController";
 import ThemeController from './controllers/ThemeController';
+import LowBandwidthController from "./controllers/LowBandwidthController";
 
 // These are just a bunch of helper arrays to avoid copy/pasting a bunch of times
 const LEVELS_ROOM_SETTINGS = ['device', 'room-device', 'room-account', 'account', 'config'];
@@ -375,7 +376,8 @@ export const SETTINGS = {
     },
     "lowBandwidth": {
         supportedLevels: LEVELS_DEVICE_ONLY_SETTINGS_WITH_CONFIG,
-        displayName: _td('Low Bandwidth Mode'),
+        displayName: _td('Low bandwidth mode'),
         default: false,
+        controller: new LowBandwidthController(),
     },
 };

src/settings/controllers/LowBandwidthController.js

@@ -0,0 +1,24 @@
+/*
+Copyright 2019 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import SettingController from "./SettingController";
+import PlatformPeg from "../../PlatformPeg";
+
+export default class LowBandwidthController extends SettingController {
+    onChange(level, roomId, newValue) {
+        PlatformPeg.get().reload();
+    }
+}