Adding opt out and previews type information to DRP pingback

chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.h

Index: chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.h
diff --git a/chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.h b/chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.h
index 19b92c1153753e1f17a4b109bca716604b9682c2..5a69ab7bf84deb05ecddf4c9709591ea8927ade7 100644
--- a/chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.h
+++ b/chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.h
@@ -110,7 +110,8 @@ class DataReductionProxyMetricsObserver
  private:
   // Sends the page load information to the pingback client.
   void SendPingback(const page_load_metrics::PageLoadTiming& timing,
-                    const page_load_metrics::PageLoadExtraInfo& info);
+                    const page_load_metrics::PageLoadExtraInfo& info,
+                    bool app_background_occured);

[bengr, 2017/04/20 01:02:33]

spelling.

[RyanSturm, 2017/04/20 20:25:44]

Done.

 
   // Records UMA of page size when the observer is about to be deleted.
   void RecordPageSizeUMA() const;
@@ -140,6 +141,9 @@ class DataReductionProxyMetricsObserver
   // The total network bytes used.
   int64_t network_bytes_;
 
+  // A key that relates to the tab.

[bengr, 2017/04/20 17:36:18]

relates how? uniquely identifies? why does the observer need tab identification?

[RyanSturm, 2017/04/20 20:25:44]

Acknowledged.

+  void* tab_identifier_key_;
+
   DISALLOW_COPY_AND_ASSIGN(DataReductionProxyMetricsObserver);
 };