Integrate throttling logic into AffiliationBackend.

components/password_manager/core/browser/fake_affiliation_api.cc

Index: components/password_manager/core/browser/fake_affiliation_api.cc
diff --git a/components/password_manager/core/browser/fake_affiliation_api.cc b/components/password_manager/core/browser/fake_affiliation_api.cc
index 38e15ad3078828050d6f4f24b771461e7ed18c21..7c398964de5a2133270950d94ee4fb09b7a58151 100644
--- a/components/password_manager/core/browser/fake_affiliation_api.cc
+++ b/components/password_manager/core/browser/fake_affiliation_api.cc
@@ -60,6 +60,14 @@ void ScopedFakeAffiliationAPI::ServeNextRequest() {
   fetcher->SimulateSuccess(fake_response.Pass());
 }
 
+void ScopedFakeAffiliationAPI::FailNextRequest() {
+  if (!fake_fetcher_factory_.has_pending_fetchers())
+    return;
+
+  FakeAffiliationFetcher* fetcher = fake_fetcher_factory_.PopNextFetcher();
+  fetcher->SimulateFailure();
+}
+
 void ScopedFakeAffiliationAPI::IgnoreNextRequest() {
   if (!fake_fetcher_factory_.has_pending_fetchers())
     return;