[Payments] Move journey logger to native.

components/payments/core/journey_logger.h

Index: components/payments/core/journey_logger.h
diff --git a/components/payments/core/journey_logger.h b/components/payments/core/journey_logger.h
new file mode 100644
index 0000000000000000000000000000000000000000..9593097009b2cb32f52dfe0a058536a80c49b185
--- /dev/null
+++ b/components/payments/core/journey_logger.h
@@ -0,0 +1,124 @@
+// 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_PAYMENTS_CORE_JOURNEY_LOGGER_H_
+#define COMPONENTS_PAYMENTS_CORE_JOURNEY_LOGGER_H_
+
+#include <string>
+
+#include "base/macros.h"
+
+namespace payments {
+
+// A class to keep track of of different stats during a Payment Request journey.

[Mathieu, 2017/03/23 21:19:48]

nit: of of

[Mathieu, 2017/03/23 21:19:48]

can you mention the usage a little bit? Also, mention when the actual stats are
logged.

[sebsg, 2017/03/24 13:35:30]

Done.

[sebsg, 2017/03/24 13:35:30]

Done.

+class JourneyLogger {
+ public:
+  // The the different sections of a Payment Request. Used to record journey

[Mathieu, 2017/03/23 21:19:48]

nit: the the

[sebsg, 2017/03/24 13:35:30]

Done.

+  // stats.
+  enum Sections {
+    SECTION_CONTACT_INFO = 0,
+    SECTION_CREDIT_CARDS,
+    SECTION_SHIPPING_ADDRESS,
+    SECTION_MAX,
+  };
+
+  // For the CanMakePayment histograms.
+  enum CanMakePaymentUsage {
+    CAN_MAKE_PAYMENT_USED = 0,
+    CAN_MAKE_PAYMENT_NOT_USED,
+    CAN_MAKE_PAYMENT_USE_MAX,
+  };
+
+  // Used to log different parameters' effect on whether the transaction was
+  // completed.
+  static const int COMPLETION_STATUS_COMPLETED = 0;
+  static const int COMPLETION_STATUS_ABORTED = 1;
+  static const int COMPLETION_STATUS_MAX = 2;
+
+  // Used to mesure the impact of the CanMakePayment return value on whether the
+  // Payment Request is shown to the user.
+  static const int CMP_SHOW_COULD_NOT_MAKE_PAYMENT_AND_DID_NOT_SHOW = 0;
+  static const int CMP_SHOW_DID_SHOW = 1 << 0;
+  static const int CMP_SHOW_could_make_payment_ = 1 << 1;

[Mathieu, 2017/03/23 21:19:48]

fix

[sebsg, 2017/03/24 13:35:29]

Done.

+  static const int CMP_SHOW_MAX = 4;
+
+  JourneyLogger();
+  ~JourneyLogger(){};

[Mathieu, 2017/03/23 21:19:48]

nit: ~JourneyLogger(); and implement in cc

[sebsg, 2017/03/24 13:35:30]

Done.

+
+  // Increments the number of selection adds for the specified section.
+  void IncrementSelectionAdds(int section);
+
+  // Increments the number of selection changes for the specified section.
+  void IncrementSelectionChanges(int section);
+
+  // Increments the number of selection edits for the specified section.
+  void IncrementSelectionEdits(int section);
+
+  // Sets the number of suggestions shown for the specified section.
+  void SetNumberOfSuggestionsShown(int section, int number);
+
+  // Records the fact that the merchant called CanMakePayment and records it's
+  // return value.
+  void SetCanMakePaymentValue(bool value);
+
+  // Records the fact that the Payment Request was shown to the user.
+  void SetShowCalled();
+
+  // Records the histograms for all the sections that were requested by the
+  // merchant and for the usage of the CanMakePayment method and its effect on
+  // the transaction. This method should be called when the Payment Request has
+  // either been completed or aborted.
+  void RecordJourneyStatsHistograms(const std::string& submission_type);
+
+ private:
+  static const int NUMBER_OF_SECTIONS = 3;
+
+  // The minimum expected value of CustomCountHistograms is always set to 1. It
+  // is still possible to log the value 0 to that type of histogram.
+  const int MIN_EXPECTED_SAMPLE = 1;
+  const int MAX_EXPECTED_SAMPLE = 49;
+  const int NUMBER_BUCKETS = 50;
+
+  class SectionStats {

[Mathieu, 2017/03/23 21:19:49]

struct?

[sebsg, 2017/03/24 13:35:29]

Done.

+   public:
+    SectionStats()
+        : number_selection_adds_(0),
+          number_selection_changes_(0),
+          number_selection_edits_(0),
+          number_suggestions_shown_(0),
+          is_requested_(false) {}
+
+    int number_selection_adds_;
+    int number_selection_changes_;
+    int number_selection_edits_;
+    int number_suggestions_shown_;
+    int is_requested_;
+  };
+
+  // Records the histograms for all the sections that were requested by the
+  // merchant.
+  void RecordSectionSpecificStats(const std::string& submission_type);
+
+  // Records the metrics related the the CanMakePayment method.
+  void RecordCanMakePaymentStats(int completion_status);
+
+  // Records CanMakePayment's return value effect on whether the Payment Request
+  // was shown or not.
+  void RecordCanMakePaymentEffectOnShow();
+
+  // Records the completion status depending on the the usage and return value
+  // of the CanMakePaymentMethod.
+  void RecordCanMakePaymentEffectOnCompletion(int completion_status);
+
+  SectionStats sections_[NUMBER_OF_SECTIONS];
+  bool was_can_make_payments_used_;
+  bool could_make_payment_;
+  bool was_show_called_;
+
+  DISALLOW_COPY_AND_ASSIGN(JourneyLogger);
+};
+
+}  // namespace payments
+
+#endif  // COMPONENTS_PAYMENTS_CORE_JOURNEY_LOGGER_H_