Introduce restricted PasswordFormManager::GrabFetcher

components/password_manager/core/browser/password_form_manager_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/password_manager/core/browser/password_form_manager.h"
 
 #include <map>
 #include <memory>
 #include <set>
 #include <utility>
@@ skipping 80 matching lines @@
 
   // Convenience downcasting method.
   static MockFormSaver& Get(PasswordFormManager* form_manager) {
     return *static_cast<MockFormSaver*>(form_manager->form_saver());
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockFormSaver);
 };
 
+class MockFormFetcher : public FakeFormFetcher {
+ public:
+  MOCK_METHOD1(AddConsumer, void(Consumer*));
+};
+
 MATCHER_P(CheckUsername, username_value, "Username incorrect") {
   return arg.username_value == username_value;
 }
 
 MATCHER_P(CheckUsernamePtr, username_value, "Username incorrect") {
   return arg && arg->username_value == username_value;
 }
 
 MATCHER_P2(CheckUploadedAutofillTypesAndSignature,
            form_signature,
@@ skipping 2841 matching lines @@
   form_manager()->ProvisionallySave(
       updated, PasswordFormManager::IGNORE_OTHER_POSSIBLE_USERNAMES);
   credentials_to_update.clear();
   EXPECT_CALL(MockFormSaver::Get(form_manager()), Update(_, _, _, nullptr))
       .WillOnce(SaveArgPointee<2>(&credentials_to_update));
   form_manager()->Save();
 
   EXPECT_THAT(credentials_to_update, IsEmpty());
 }
 
+// Check that if asked to take ownership of the same FormFetcher which it had
+// consumed before, the PasswordFormManager does not add itself as a consumer
+// again.
+TEST_F(PasswordFormManagerTest, GrabFetcher_Same) {
+  auto fetcher = base::MakeUnique<MockFormFetcher>();
+  fetcher->Fetch();
+  PasswordFormManager form_manager(
+      password_manager(), client(), client()->driver(), *observed_form(),
+      base::MakeUnique<MockFormSaver>(), fetcher.get());
+
+  EXPECT_CALL(*fetcher, AddConsumer(_)).Times(0);
+  form_manager.GrabFetcher(std::move(fetcher));
+}
+
 }  // namespace password_manager