Update DataReductionProxy page load metrics to log immediately.

chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_DATA_REDUCTION_PROXY_METRICS_OBSERVER_H_
 #define CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_DATA_REDUCTION_PROXY_METRICS_OBSERVER_H_
 
 #include "base/macros.h"
 #include "components/page_load_metrics/browser/page_load_metrics_observer.h"
 
@@ skipping 19 matching lines @@
 // Observer responsible for recording core page load metrics releveant to
 // DataReductionProxy.
 class DataReductionProxyMetricsObserver
     : public page_load_metrics::PageLoadMetricsObserver {
  public:
   DataReductionProxyMetricsObserver();
   ~DataReductionProxyMetricsObserver() override;
 
   // page_load_metrics::PageLoadMetricsObserver:
   void OnCommit(content::NavigationHandle* navigation_handle) override;
-  void OnComplete(const page_load_metrics::PageLoadTiming& timing,
-                  const page_load_metrics::PageLoadExtraInfo& info) override;
-
-  void RecordTimingHistograms(
+  void OnFirstContentfulPaint(
       const page_load_metrics::PageLoadTiming& timing,
-      const page_load_metrics::PageLoadExtraInfo& info) const;
+      const page_load_metrics::PageLoadExtraInfo& info) override;
 
  private:
   // True if the navigation requested LoFi.
   bool lofi_requested_;
 
   // True if the navigation was proxied through the data reduction proxy.
   bool used_data_reduction_proxy_;
 
   DISALLOW_COPY_AND_ASSIGN(DataReductionProxyMetricsObserver);
 };
 
 }  // namespace data_reduction_proxy
 
 #endif  // CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_DATA_REDUCTION_PROXY_METRICS_OBSERVER_H_