Adding ExtraRequest info and exposing request to PLM observers

chrome/browser/page_load_metrics/observers/core_page_load_metrics_observer.h

Index: chrome/browser/page_load_metrics/observers/core_page_load_metrics_observer.h
diff --git a/chrome/browser/page_load_metrics/observers/core_page_load_metrics_observer.h b/chrome/browser/page_load_metrics/observers/core_page_load_metrics_observer.h
index 98f7df39730e4a8e17ff107396999b787ec170ba..ff9a8d666bb391072dcf2c777be0208067ecb046 100644
--- a/chrome/browser/page_load_metrics/observers/core_page_load_metrics_observer.h
+++ b/chrome/browser/page_load_metrics/observers/core_page_load_metrics_observer.h
@@ -109,6 +109,8 @@ class CorePageLoadMetricsObserver
       const page_load_metrics::FailedProvisionalLoadInfo& failed_load_info,
       const page_load_metrics::PageLoadExtraInfo& extra_info) override;
   void OnUserInput(const blink::WebInputEvent& event) override;
+  void OnLoadedResource(
+      const page_load_metrics::ExtraRequestInfo& extra_request_info) override;
 
  private:
   void RecordTimingHistograms(const page_load_metrics::PageLoadTiming& timing,
@@ -119,6 +121,17 @@ class CorePageLoadMetricsObserver
   ui::PageTransition transition_;
   bool was_no_store_main_resource_;
 
+  // Note: these are only approximations, based on WebContents attribution from
+  // ResourceRequestInfo objects while this is the currently committed load in
+  // the WebContents.
+  int num_cache_requests_;
+  int num_network_requests_;
+
+  // The number of body (not header) prefilter bytes consumed by requests for
+  // the page.
+  int64_t cache_bytes_;
+  int64_t network_bytes_;
+
   // True if we've received a non-scroll input (touch tap or mouse up)
   // after first paint has happened.
   bool received_non_scroll_input_after_first_paint_ = false;