Add PLT measurement to Resource Prefetching for Mobile Web

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 <map>
 #include <string>
 #include <vector>
@@ skipping 246 matching lines @@
                                           PrefetchDataMap* data_map);
 
   // Merges resources in |new_resources| into the |data_map| and correspondingly
   // updates the predictor database.
   void LearnNavigation(const std::string& key,
                        PrefetchKeyType key_type,
                        const std::vector<URLRequestSummary>& new_resources,
                        size_t max_data_map_size,
                        PrefetchDataMap* data_map);
 
+  // Reports overall page load time.
+  void ReportPageLoadTimeStats(base::TimeDelta plt) const;
+
+  // Reports page load time for prefetched and not prefetched pages
+  void ReportPageLoadTimePrefetchStats(
+      base::TimeDelta plt,
+      bool prefetched,
+      base::Callback<void(int)> report_network_type_callback,
+      PrefetchKeyType key_type = PREFETCH_KEY_TYPE_URL) const;

[Alexei Svitkine (slow), 2014/10/27 14:59:10]

Nit: I thinks style guide discourages use of default param values.

[Zhen Wang, 2014/10/27 18:09:46]

Done.

+
   // Reports accuracy by comparing prefetched resources with resources that are
   // actually used by the page.
   void ReportAccuracyStats(PrefetchKeyType key_type,
                            const std::vector<URLRequestSummary>& actual,
                            ResourcePrefetcher::RequestVector* prefetched) const;
 
   // Reports predicted accuracy i.e. by comparing resources that are actually
   // used by the page with those that may have been prefetched.
   void ReportPredictedAccuracyStats(
       PrefetchKeyType key_type,
@@ skipping 28 matching lines @@
 
   ResultsMap results_map_;
   STLValueDeleter<ResultsMap> results_map_deleter_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourcePrefetchPredictor);
 };
 
 }  // namespace predictors
 
 #endif  // CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_PREDICTOR_H_