predictors: Add prefetching hit/miss histograms.

chrome/browser/predictors/resource_prefetch_predictor.h

 // Copyright 2014 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 CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_PREDICTOR_H_
 #define CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_PREDICTOR_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 29 matching lines @@
 
 namespace internal {
 constexpr char kResourcePrefetchPredictorPrecisionHistogram[] =
     "ResourcePrefetchPredictor.LearningPrecision";
 constexpr char kResourcePrefetchPredictorRecallHistogram[] =
     "ResourcePrefetchPredictor.LearningRecall";
 constexpr char kResourcePrefetchPredictorCountHistogram[] =
     "ResourcePrefetchPredictor.LearningCount";
 constexpr char kResourcePrefetchPredictorPrefetchingDurationHistogram[] =
     "ResourcePrefetchPredictor.PrefetchingDuration";
+constexpr char kResourcePrefetchPredictorPrefetchMissesCountCached[] =
+    "ResourcePrefetchPredictor.PrefetchMissesCount.Cached";
+constexpr char kResourcePrefetchPredictorPrefetchMissesCountNotCached[] =
+    "ResourcePrefetchPredictor.PrefetchMissesCount.NotCached";
+constexpr char kResourcePrefetchPredictorPrefetchHitsCountCached[] =
+    "ResourcePrefetchPredictor.PrefetchHitsCount.Cached";
+constexpr char kResourcePrefetchPredictorPrefetchHitsCountNotCached[] =
+    "ResourcePrefetchPredictor.PrefetchHitsCount.NotCached";
+constexpr char kResourcePrefetchPredictorPrefetchHitsSize[] =
+    "ResourcePrefetchPredictor.PrefetchHitsSizeKB";
+constexpr char kResourcePrefetchPredictorPrefetchMissesSize[] =
+    "ResourcePrefetchPredictor.PrefetchMissesSizeKB";
 }  // namespace internal
 
 class TestObserver;
 class ResourcePrefetcherManager;
 
 // Contains logic for learning what can be prefetched and for kicking off
 // speculative prefetching.
 // - The class is a profile keyed service owned by the profile.
 // - All the non-static methods of this class need to be called on the UI
 //   thread.
@@ skipping 107 matching lines @@
   // Starts prefetching if it is enabled for |origin| and prefetching data
   // exists for the |main_frame_url| either at the URL or at the host level.
   void StartPrefetching(const GURL& main_frame_url, PrefetchOrigin origin);
 
   // Stops prefetching that may be in progress corresponding to
   // |main_frame_url|.
   void StopPrefetching(const GURL& main_frame_url);
 
   // Called when ResourcePrefetcher is finished, i.e. there is nothing pending
   // in flight.
-  void OnPrefetchingFinished(const GURL& main_frame_url);
+  void OnPrefetchingFinished(
+      const GURL& main_frame_url,
+      std::unique_ptr<ResourcePrefetcher::PrefetcherStats> stats);
 
   // Returns true if prefetching data exists for the |main_frame_url|.
   virtual bool IsUrlPrefetchable(const GURL& main_frame_url);
 
   // Sets the |observer| to be notified when the resource prefetch predictor
   // data changes. Previously registered observer will be discarded. Call
   // this with nullptr parameter to de-register observer.
   void SetObserverForTesting(TestObserver* observer);
 
  private:
@@ skipping 27 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(ResourcePrefetchPredictorTest,
                            TestPrecisionRecallHistograms);
   FRIEND_TEST_ALL_PREFIXES(ResourcePrefetchPredictorTest,
                            TestPrefetchingDurationHistogram);
 
   enum InitializationState {
     NOT_INITIALIZED = 0,
     INITIALIZING = 1,
     INITIALIZED = 2
   };
-
   typedef ResourcePrefetchPredictorTables::PrefetchDataMap PrefetchDataMap;
   typedef ResourcePrefetchPredictorTables::RedirectDataMap RedirectDataMap;
 
   typedef std::map<NavigationID, std::unique_ptr<PageRequestSummary>>
       NavigationMap;
 
   // Returns true if the main page request is supported for prediction.
   static bool IsHandledMainPage(net::URLRequest* request);
 
   // Returns true if the subresource request is supported for prediction.
@@ skipping 45 matching lines @@
   // all arguments.
   void CreateCaches(std::unique_ptr<PrefetchDataMap> url_data_map,
                     std::unique_ptr<PrefetchDataMap> host_data_map,
                     std::unique_ptr<RedirectDataMap> url_redirect_data_map,
                     std::unique_ptr<RedirectDataMap> host_redirect_data_map);
 
   // Called during initialization when history is read and the predictor
   // database has been read.
   void OnHistoryAndCacheLoaded();
 
-  // Removes data for navigations where the onload never fired. Will cleanup
-  // inflight_navigations_ and inflight_prefetches_.
+  // Cleanup inflight_navigations_, inflight_prefetches_, and prefetcher_stats_.
   void CleanupAbandonedNavigations(const NavigationID& navigation_id);
 
   // Deletes all URLs from the predictor database, the caches and removes all
   // inflight navigations.
   void DeleteAllUrls();
 
   // Deletes data for the input |urls| and their corresponding hosts from the
   // predictor database and caches.
   void DeleteUrls(const history::URLRows& urls);
 
@@ skipping 63 matching lines @@
 
   // Copy of the data in the predictor tables.
   std::unique_ptr<PrefetchDataMap> url_table_cache_;
   std::unique_ptr<PrefetchDataMap> host_table_cache_;
   std::unique_ptr<RedirectDataMap> url_redirect_table_cache_;
   std::unique_ptr<RedirectDataMap> host_redirect_table_cache_;
 
   std::map<GURL, base::TimeTicks> inflight_prefetches_;
   NavigationMap inflight_navigations_;
 
+  std::map<GURL, std::unique_ptr<ResourcePrefetcher::PrefetcherStats>>
+      prefetcher_stats_;
+
   ScopedObserver<history::HistoryService, history::HistoryServiceObserver>
       history_service_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourcePrefetchPredictor);
 };
 
 // An interface used to notify that data in the ResourcePrefetchPredictor
 // has changed. All methods are invoked on the UI thread.
 class TestObserver {
  public:
@@ skipping 15 matching lines @@
 
  private:
   ResourcePrefetchPredictor* predictor_;
 
   DISALLOW_COPY_AND_ASSIGN(TestObserver);
 };
 
 }  // namespace predictors
 
 #endif  // CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_PREDICTOR_H_