Add missing IntentMonitor for startActivity with user overload

With the current code, any calls to startActivityAsUser will be missed by espresso-intent or similar intent monitoring facilities.

PiperOrigin-RevId: 778706440

Author: copybara-androidxtest

runner/monitor/CHANGELOG.md

@@ -6,6 +6,9 @@
 
 **Bug Fixes**
 
+* Fixes missing IntentMonitor for startActivity with user overload. Now it's
+  possible to intercept intents started with startActivityAsUser.
+
 **New Features**
 
 **Breaking Changes**

runner/monitor/java/androidx/test/runner/MonitoringInstrumentation.java

@@ -622,6 +622,12 @@ public ActivityResult execStartActivity(
       int requestCode,
       Bundle options,
       UserHandle user) {
+    intentMonitor.signalIntent(intent);
+    ActivityResult ar = stubResultFor(intent);
+    if (ar != null) {
+      Log.i(TAG, String.format("Stubbing intent %s", intent));
+      return ar;
+    }
     return super.execStartActivity(
         who, contextThread, token, target, intent, requestCode, options, user);
   }