Adding DRP specfic UMA for FirstContentfulPaint

components/page_load_metrics/browser/metrics_web_contents_observer.h

Index: components/page_load_metrics/browser/metrics_web_contents_observer.h
diff --git a/components/page_load_metrics/browser/metrics_web_contents_observer.h b/components/page_load_metrics/browser/metrics_web_contents_observer.h
index 3dd626b14bb32f52ca67f0807efbf61a990e0dd0..f53e30f1a5a6edc5beb5de0e8a59709e3de98be7 100644
--- a/components/page_load_metrics/browser/metrics_web_contents_observer.h
+++ b/components/page_load_metrics/browser/metrics_web_contents_observer.h
@@ -116,20 +116,24 @@ class PageLoadTracker {
   base::TimeTicks abort_time() const { return abort_time_; }
 
   void AddObserver(scoped_ptr<PageLoadMetricsObserver> observer);
 
   // If the user performs some abort-like action while we are tracking this page
   // load, notify the tracker. Note that we may not classify this as an abort if
   // we've already performed a first paint.
   void NotifyAbort(UserAbortType abort_type, const base::TimeTicks& timestamp);
   void UpdateAbort(UserAbortType abort_type, const base::TimeTicks& timestamp);
 
+  void set_is_using_lofi(bool is_using_lofi);
+  void set_was_fetched_via_data_reduction_proxy(
+      bool was_fetched_via_data_reduction_proxy);
+
  private:
   PageLoadExtraInfo GetPageLoadMetricsInfo();
   // Only valid to call post-commit.
   const GURL& committed_url();
 
   void RecordTimingHistograms(const PageLoadExtraInfo& info);
   void UpdateAbortInternal(UserAbortType abort_type,
                            const base::TimeTicks& timestamp);
 
   // Whether the renderer should be sending timing IPCs to this page load.
@@ -155,20 +159,23 @@ class PageLoadTracker {
   base::TimeTicks foreground_time_;
   bool started_in_foreground_;
 
   PageLoadTiming timing_;
 
   // Interface to chrome features. Must outlive the class.
   PageLoadMetricsEmbedderInterface* const embedder_interface_;
 
   std::vector<scoped_ptr<PageLoadMetricsObserver>> observers_;
 
+  bool is_using_lofi_;

[bengr, 2016/02/26 22:53:57]

Add comments.

[RyanSturm, 2016/03/01 19:36:04]

Done.

+  bool was_fetched_via_data_reduction_proxy_;
+
   DISALLOW_COPY_AND_ASSIGN(PageLoadTracker);
 };
 
 // MetricsWebContentsObserver tracks page loads and loading metrics
 // related data based on IPC messages received from a
 // MetricsRenderFrameObserver.
 class MetricsWebContentsObserver
     : public content::WebContentsObserver,
       public content::WebContentsUserData<MetricsWebContentsObserver> {
  public: