FxA: Expose the process_event method on android

components/fxa-client/android/src/main/java/mozilla/appservices/fxaclient/FxaClient.kt

@@ -88,6 +88,14 @@ class FxaClient(inner: FirefoxAccount, persistCallback: PersistCallback?) : Auto
         }
     }
 
+    /**
+     * Process an event (login, logout, etc).
+     *
+     * On success, update the current state and return it.
+     * On error, the current state will remain the same.
+     */
+    fun processEvent(event: FxaEvent): FxaState = this.inner.processEvent(event)
+
     /**
      * Get the high-level authentication state of the client
      */