status/camera: New indicator

Add a new status indicator following the system-status-indicators
mockup.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2840>

js/ui/status/camera.js

@@ -0,0 +1,22 @@
+// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
+/* exported Indicator */
+
+const GObject = imports.gi.GObject;
+const Shell = imports.gi.Shell;
+
+const {SystemIndicator} = imports.ui.quickSettings;
+
+var Indicator = GObject.registerClass(
+class Indicator extends SystemIndicator {
+    constructor() {
+        super();
+
+        this._indicator = this._addIndicator();
+        this._indicator.icon_name = 'camera-web-symbolic';
+        this._indicator.add_style_class_name('privacy-indicator');
+
+        this._cameraMonitor = new Shell.CameraMonitor();
+        this._cameraMonitor.bind_property('cameras-in-use', this._indicator,
+            'visible', GObject.BindingFlags.SYNC_CREATE);
+    }
+});