Add PLT measurement to Resource Prefetching for Mobile Web

chrome/browser/predictors/resource_prefetch_predictor.h

Index: chrome/browser/predictors/resource_prefetch_predictor.h
diff --git a/chrome/browser/predictors/resource_prefetch_predictor.h b/chrome/browser/predictors/resource_prefetch_predictor.h
index e82384f5bf8ec3aafc4cf17c6c25a94f09ef189c..5b1905d504a4392008cfa01815c602b386e54d3d 100644
--- a/chrome/browser/predictors/resource_prefetch_predictor.h
+++ b/chrome/browser/predictors/resource_prefetch_predictor.h
@@ -264,6 +264,14 @@ class ResourcePrefetchPredictor
                        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 ReportPageLoadTimePrefetchedStats(PrefetchKeyType key_type,
+                                         base::TimeDelta plt) const;
+  void ReportPageLoadTimeNotPrefetchedStats(base::TimeDelta plt) const;
+
   // Reports accuracy by comparing prefetched resources with resources that are
   // actually used by the page.
   void ReportAccuracyStats(PrefetchKeyType key_type,