Make test less flaky. (#195)

Author: MeghaB

firebase-inappmessaging/src/androidTest/java/com/google/firebase/inappmessaging/FirebaseInAppMessagingFlowableTest.java

@@ -740,6 +740,9 @@ public void logDismiss_writesExpectedLogToClearcut() throws InvalidProtocolBuffe
     waitUntilNotified(subscriber);
     assertSingleSuccessNotification(subscriber);
 
+    Task<Void> logImpression = instance.logImpression(MODAL_IN_APP_MESSAGE);
+    await().timeout(2, SECONDS).until(logImpression::isComplete);
+
     Task<Void> logAction = instance.logDismiss(MODAL_IN_APP_MESSAGE, FiamDismissType.AUTO);
     await().timeout(2, SECONDS).until(logAction::isComplete);