Create PasswordProtectionRequest to handle password pings

components/safe_browsing/password_protection/password_protection_request.h

Index: components/safe_browsing/password_protection/password_protection_request.h
diff --git a/components/safe_browsing/password_protection/password_protection_request.h b/components/safe_browsing/password_protection/password_protection_request.h
new file mode 100644
index 0000000000000000000000000000000000000000..7d0f77c64181b0caccbc3055b7326a44b6e815e1
--- /dev/null
+++ b/components/safe_browsing/password_protection/password_protection_request.h
@@ -0,0 +1,103 @@
+// 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_SAFE_BROWSING_PASSWORD_PROTECTION_PASSWORD_PROTECTION_REQUEST_H_
+#define COMPONENTS_SAFE_BROWSING_PASSWORD_PROTECTION_PASSWORD_PROTECTION_REQUEST_H_
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "components/safe_browsing/password_protection/password_protection_service.h"
+#include "net/url_request/url_fetcher.h"
+#include "net/url_request/url_fetcher_delegate.h"
+#include "net/url_request/url_request_status.h"
+
+class GURL;
+
+namespace safe_browsing {
+
+class PasswordProtectionRequest : public net::URLFetcherDelegate {
+ public:
+  // The outcome of the request. These values are used for UMA.
+  // DO NOT CHANGE THE ORDERING OF THESE VALUES.
+  enum RequestOutcome {
+    UNKNOWN = 0,
+    SUCCEEDED = 1,
+    CANCELED = 2,
+    TIMEDOUT = 3,
+    MATCHED_WHITELIST = 4,
+    RESPONSE_ALREADY_CACHED = 5,
+    NO_EXTENDED_REPORTING = 6,
+    INCOGNITO = 7,
+    REQUEST_MALFORMED = 8,
+    FETCH_FAILED = 9,
+    RESPONSE_MALFORMED = 10,
+    SERVICE_DESTROYED = 11,
+    MAX_OUTCOME

[Nathan Parker, 2017/03/24 00:41:50]

Don't forget histograms.xml 

[Jialiu Lin, 2017/03/24 01:42:43]

histograms enums are always numbered. :-)

+  };
+
+  PasswordProtectionRequest(const GURL& main_frame_url,
+                            LoginReputationClientRequest::TriggerType type,
+                            bool is_extended_reporting,
+                            bool is_incognito,
+                            base::WeakPtr<PasswordProtectionService> pps,
+                            int request_timeout_in_ms);
+
+  ~PasswordProtectionRequest() override;
+
+  base::WeakPtr<PasswordProtectionRequest> GetWeakPtr() {
+    return weakptr_factory_.GetWeakPtr();
+  }
+
+  // Starts processing request by checking extended reporting and incognito
+  // conditions.
+  void Start();
+
+  // Cancels the current request. |timed_out| indicates if this cancellation is
+  // due to timeout. This function will call Finish() to destroy |this|.
+  void Cancel(bool timed_out);
+
+  GURL main_frame_url() const { return main_frame_url_; }
+
+  bool is_incognito() const { return is_incognito_; }
+
+  // net::URLFetcherDelegate override.
+  // Processes the received response.
+  void OnURLFetchComplete(const net::URLFetcher* source) override;
+
+ private:
+  // Start a timeout to cancel the request if it takes too long.

[Nathan Parker, 2017/03/24 00:41:50]

nit: s/timeout/timer

[Jialiu Lin, 2017/03/24 01:42:43]

Done.

+  void StartTimeout();
+
+  // |this| will be gone after calling this function.

[Nathan Parker, 2017/03/24 00:41:50]

s/gone/destroyed

[Jialiu Lin, 2017/03/24 01:42:43]

Done.

+  void Finish(RequestOutcome outcome,
+              std::unique_ptr<LoginReputationClientResponse> response);
+
+  void CheckWhitelistsOnUIThread();
+
+  // If |main_frame_url_| matches whitelist, call Finish() immediately;
+  // otherwise call CheckCachedVerdicts().
+  void OnWhitelistCheckDone(bool match_whitelist);
+
+  // Looks up cached verdicts. If verdict is already cached, call SendRequest();
+  // otherwise call Finish().
+  void CheckCachedVerdicts();
+
+  void SendRequest();
+
+  GURL main_frame_url_;
+  LoginReputationClientRequest::TriggerType request_type_;
+  bool is_extended_reporting_;

[Nathan Parker, 2017/03/24 00:41:50]

Can some of these be const?

[Jialiu Lin, 2017/03/24 01:42:43]

Oh yes! Done.

+  bool is_incognito_;
+  base::TimeTicks request_start_time_;
+  base::TimeTicks timeout_start_time_;
+  std::unique_ptr<net::URLFetcher> fetcher_;
+  base::WeakPtr<PasswordProtectionService> password_protection_service_;
+  int request_timeout_in_ms_;
+  base::WeakPtrFactory<PasswordProtectionRequest> weakptr_factory_;
+  DISALLOW_COPY_AND_ASSIGN(PasswordProtectionRequest);
+};
+
+}  // namespace safe_browsing
+
+#endif  // COMPONENTS_SAFE_BROWSING_PASSWORD_PROTECTION_PASSWORD_PROTECTION_REQUEST_H_