Adding parse UMA and pingback metrics

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 d1f4f8718c89a34d75e411da6340913221fbf8e3..24780c8e94ad505d0be230f6bd8d6a48f4200e1b 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
@@ -30,20 +30,22 @@ namespace internal {
 extern const char kHistogramDataReductionProxyPrefix[];
 extern const char kHistogramDataReductionProxyLoFiOnPrefix[];
 extern const char kHistogramDOMContentLoadedEventFiredSuffix[];
 extern const char kHistogramFirstLayoutSuffix[];
 extern const char kHistogramLoadEventFiredSuffix[];
 extern const char kHistogramFirstContentfulPaintSuffix[];
 extern const char kHistogramFirstImagePaintSuffix[];
 extern const char kHistogramFirstPaintSuffix[];
 extern const char kHistogramFirstTextPaintSuffix[];
 extern const char kHistogramParseStartSuffix[];
+extern const char kHistogramParseBlockedOnScriptLoadSuffix[];
+extern const char kHistogramParseDurationSuffix[];
 
 }  // namespace internal
 
 // Observer responsible for recording core page load metrics releveant to
 // DataReductionProxy.
 class DataReductionProxyMetricsObserver
     : public page_load_metrics::PageLoadMetricsObserver {
  public:
   DataReductionProxyMetricsObserver();
   ~DataReductionProxyMetricsObserver() override;
@@ -66,20 +68,22 @@ class DataReductionProxyMetricsObserver
       const page_load_metrics::PageLoadTiming& timing,
       const page_load_metrics::PageLoadExtraInfo& info) override;
   void OnFirstImagePaint(
       const page_load_metrics::PageLoadTiming& timing,
       const page_load_metrics::PageLoadExtraInfo& info) override;
   void OnFirstContentfulPaint(
       const page_load_metrics::PageLoadTiming& timing,
       const page_load_metrics::PageLoadExtraInfo& info) override;
   void OnParseStart(const page_load_metrics::PageLoadTiming& timing,
                     const page_load_metrics::PageLoadExtraInfo& info) override;
+  void OnParseStop(const page_load_metrics::PageLoadTiming& timing,
+                   const page_load_metrics::PageLoadExtraInfo& info) override;
 
  private:
   // Gets the default DataReductionProxyPingbackClient. Overridden in testing.
   virtual DataReductionProxyPingbackClient* GetPingbackClient() const;
 
   // Data related to this navigation.
   std::unique_ptr<DataReductionProxyData> data_;
 
   // The browser context this navigation is operating in.
   content::BrowserContext* browser_context_;