Send TranslateEventProtos to UMA.

components/translate/core/browser/translate_ranker.h

 // Copyright 2016 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_TRANSLATE_CORE_BROWSER_TRANSLATE_RANKER_H_
 #define COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_RANKER_H_
 
 #include <memory>
 #include <string>
 
 #include "base/feature_list.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/singleton.h"
 
 namespace chrome_intelligence {
 class TranslateRankerModel;
 }
 
+namespace metrics {
+class TranslateEventProto;
+}
+
 namespace translate {
 
 class TranslatePrefs;
 class TranslateRankerMetricsProvider;
 class TranslateURLFetcher;
 
-// Features used to enable ranker query and enforcement. Note that enabling
-// enforcement implies (forces) enabling queries.
+// Features used to enable ranker query, enforcement and logging. Note that
+// enabling enforcement implies (forces) enabling queries.
 extern const base::Feature kTranslateRankerQuery;
 extern const base::Feature kTranslateRankerEnforcement;
+extern const base::Feature kTranslateRankerLogging;
 
 // If enabled, downloads a translate ranker model and uses it to determine
 // whether the user should be given a translation prompt or not.
 class TranslateRanker {
  public:
   ~TranslateRanker();
 
   // Returns true if query or enforcement is enabled.
   static bool IsEnabled();
 
+  // Returns true if translate events logging is enabled.
+  static bool IsLoggingEnabled();
+
   // Returns the singleton TranslateRanker instance.
   static TranslateRanker* GetInstance();
 
   // For testing only. Returns a TranslateRanker instance preloaded with a
   // TranslateRankerModel as defined by |model_data|.
   static std::unique_ptr<TranslateRanker> CreateForTesting(
       const std::string& model_data);
 
   // Initiates downloading of the assist model data. This is a NOP if the model
   // data has already been downloaded.
   void FetchModelData();
 
   // Returns true if executing the ranker model in the translation prompt
   // context described by |translate_prefs|, |src_lang|, |dst_lang| and possibly
   // other global browser context attributes suggests that the user should be
   // prompted as to whether translation should be performed.
   bool ShouldOfferTranslation(const TranslatePrefs& translate_prefs,
                               const std::string& src_lang,
                               const std::string& dst_lang);
 
   // Returns the model version (a date stamp) or 0 if there is no valid model.
   int GetModelVersion() const;
 
+  // Caches the translate event.
+  void RecordTranslateEvent(
+      const metrics::TranslateEventProto& translate_event);
+
+  // Transfers cached translate events to the given vector pointer and clears
+  // the cache.
+  void FlushTranslateEvents(
+      std::vector<metrics::TranslateEventProto>* translate_events);
+
  private:
   // The ID which is assigned to the underlying URLFetcher.
   static constexpr int kFetcherId = 2;
 
   TranslateRanker();
 
   // Exposed for testing via FRIEND_TEST.
   double CalculateScore(double accept_ratio,
                         double decline_ratio,
                         double ignore_ratio,
@@ skipping 12 matching lines @@
   std::unique_ptr<TranslateURLFetcher> model_fetcher_;
 
   // The next time before which no new attempts to download the model should be
   // attempted.
   base::Time next_earliest_download_time_;
 
   // Tracks the last time the translate ranker attempted to download its model.
   // Used for UMA reporting of timing.
   base::Time download_start_time_;
 
+  // Saved cache of translate event protos.
+  std::vector<metrics::TranslateEventProto> translate_events_cache_;
+
   FRIEND_TEST_ALL_PREFIXES(TranslateRankerTest, CalculateScore);
 
   friend struct base::DefaultSingletonTraits<TranslateRanker>;
 
   DISALLOW_COPY_AND_ASSIGN(TranslateRanker);
 };
 
 }  // namespace translate
 
 #endif  // COMPONENTS_TRANSLATE_CORE_BROWSER_TRANSLATE_RANKER_H_