IdleBackground, clean up lock service chrome refs

src/background/idle.background.ts

@@ -0,0 +1,31 @@
+import ConstantsService from '../services/constants.service';
+import LockService from '../services/lock.service';
+import MainBackground from './main.background';
+
+import { StorageService } from '../services/abstractions/storage.service';
+
+export default class IdleBackground {
+    private idle: any;
+
+    constructor(private main: MainBackground, private lockService: LockService,
+        private storageService: StorageService) {
+        this.idle = chrome.idle;
+    }
+
+    async init() {
+        if (!this.idle) {
+            return;
+        }
+
+        if (this.idle.onStateChanged) {
+            this.idle.onStateChanged.addListener(async (newState: string) => {
+                if (newState === 'locked') {
+                    const lockOption = await this.storageService.get<number>(ConstantsService.lockOptionKey);
+                    if (lockOption === -2) {
+                        this.lockService.lock();
+                    }
+                }
+            });
+        }
+    }
+}