Bug 1716884 - Allow experimenting with disabling Keep in Dock / Pin to taskbar r=andreio

Add new NimbusFeature.shellService that is available at startup, e.g., for default browser prompt.

Differential Revision: https://phabricator.services.mozilla.com/D118092

browser/components/shell/ShellService.jsm

@@ -13,15 +13,11 @@ const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
 const { XPCOMUtils } = ChromeUtils.import(
   "resource://gre/modules/XPCOMUtils.jsm"
 );
-ChromeUtils.defineModuleGetter(
-  this,
-  "WindowsRegistry",
-  "resource://gre/modules/WindowsRegistry.jsm"
-);
-
 XPCOMUtils.defineLazyModuleGetters(this, {
-  Subprocess: "resource://gre/modules/Subprocess.jsm",
+  NimbusFeatures: "resource://nimbus/ExperimentAPI.jsm",
   setTimeout: "resource://gre/modules/Timer.jsm",
+  Subprocess: "resource://gre/modules/Subprocess.jsm",
+  WindowsRegistry: "resource://gre/modules/WindowsRegistry.jsm",
 });
 
 XPCOMUtils.defineLazyServiceGetter(
@@ -277,6 +273,11 @@ let ShellServiceInternal = {
       );
     }
 
+    // Pretend pinning is not needed/supported if remotely disabled.
+    if (NimbusFeatures.shellService.getVariable("disablePin")) {
+      return false;
+    }
+
     // Currently this only works on certain Windows versions.
     try {
       // First check if we can even pin the app where an exception means no.