Introduce authentication service.

services/android/intent_receiver.mojom

Index: services/android/intent_receiver.mojom
diff --git a/services/android/intent_receiver.mojom b/services/android/intent_receiver.mojom
index a61df69b7945fdce24a395b0ee09447b1d65a3a8..caa2f3f491ac529b741e3a1b29aeee51c4c93c30 100644
--- a/services/android/intent_receiver.mojom
+++ b/services/android/intent_receiver.mojom
@@ -12,13 +12,23 @@ interface IntentReceiverManager {
   // caller can then transform this intent into a PendingIntent using
   // |PendingIntent#getService| and send it to another android application.
   // Whenever the pending intent is executed, the receiver will be called with
-  // the content of the received intent. To be noted: this will fail if the
-  // received intent is active (contains either a Binder or a file descriptor).
-  RegisterReceiver(IntentReceiver receiver) => (array<uint8> intent);
+  // the content of the received intent.
+  // To be noted, this will fail if the received intent is active (contains
+  // either a Binder or a file descriptor).
+  RegisterIntentReceiver(IntentReceiver receiver) => (array<uint8>? intent);
+
+  // This method takes an |IntentReceiver| and returns a serialized intent.
+  // The serialized intent can be deserialized using an android parcel. The
+  // caller can then add an intent it wants the system to send using
+  // |Activity#startActivityForResult| and then send it using
+  // |Context#startService|. Whenever the started activity sends a result, the
+  // receiver will be called with the content of the received intent. If the
+  // activity is cancelled, the receiver will be closed.
+  RegisterActivityResultReceiver(IntentReceiver receiver) =>
+      (array<uint8>? intent);
 };
 
-// Receiver interface, to be used with
-// |IntentReceiverManager.RegisterReceiver|.
+// Receiver interface, to be used with |IntentReceiverManager|.
 interface IntentReceiver {
   OnIntent(array<uint8> intent);
 };