Introduce SuppressedHTTPSFormFetcher.

components/password_manager/core/browser/suppressed_https_form_fetcher.h

Index: components/password_manager/core/browser/suppressed_https_form_fetcher.h
diff --git a/components/password_manager/core/browser/suppressed_https_form_fetcher.h b/components/password_manager/core/browser/suppressed_https_form_fetcher.h
new file mode 100644
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+++ b/components/password_manager/core/browser/suppressed_https_form_fetcher.h
@@ -0,0 +1,62 @@
+// Copyright 2017 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.
+
+#ifndef COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_SUPPRESSED_HTTPS_FORM_FETCHER_H_
+#define COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_SUPPRESSED_HTTPS_FORM_FETCHER_H_
+
+#include <memory>
+#include <vector>
+
+#include "base/gtest_prod_util.h"
+#include "base/macros.h"
+#include "components/autofill/core/common/password_form.h"
+#include "components/password_manager/core/browser/password_store_consumer.h"
+
+class GURL;
+
+namespace password_manager {
+
+class PasswordManagerClient;
+
+// Fetches credentials saved for the HTTPS counterpart of the given HTTP origin.
+//
+// Filling these HTTPS credentials into forms served over HTTP is obviously
+// suppressed, the purpose of doing such a query is to collect metrics on how
+// often this happens and inconveniences the user.
+//
+// This logic is implemented by this class, a separate PasswordStore consumer,
+// to make it very sure that these credentials will not get mistakenly filled.
+class SuppressedHTTPSFormFetcher : public PasswordStoreConsumer {
+ public:
+  // Interface to be implemented by the consumer of this class.
+  class Consumer {
+   public:
+    virtual void ProcessSuppressedHTTPSForms(
+        std::vector<std::unique_ptr<autofill::PasswordForm>> forms) = 0;
+  };
+
+  SuppressedHTTPSFormFetcher(const GURL& http_origin,
+                             const PasswordManagerClient* client,
+                             Consumer* consumer);
+  ~SuppressedHTTPSFormFetcher() override;
+
+ protected:
+  // PasswordStoreConsumer:
+  void OnGetPasswordStoreResults(
+      std::vector<std::unique_ptr<autofill::PasswordForm>> results) override;
+
+ private:
+  FRIEND_TEST_ALL_PREFIXES(SuppressedHTTPSFormFetcherTest, EmptyStore);
+  FRIEND_TEST_ALL_PREFIXES(SuppressedHTTPSFormFetcherTest, FullStore);
+
+  // The client and the consumer should outlive |this|.
+  const PasswordManagerClient* client_;
+  Consumer* consumer_;
+
+  DISALLOW_COPY_AND_ASSIGN(SuppressedHTTPSFormFetcher);
+};
+
+}  // namespace password_manager
+
+#endif  // COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_SUPPRESSED_HTTPS_FORM_FETCHER_H_