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 7a1166e849238d18a2d970abc3391bb5506a580d..1bd58749f96a62257da693f3e95775ce73a34083 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,