Update DataReductionProxy page load metrics to log immediately.

chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.cc

 // 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.
 
 #include "chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.h"
 
 #include "chrome/browser/renderer_host/chrome_navigation_data.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_data.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_params.h"
 #include "components/page_load_metrics/browser/page_load_metrics_observer.h"
 #include "components/page_load_metrics/browser/page_load_metrics_util.h"
 #include "components/page_load_metrics/common/page_load_timing.h"
 #include "content/public/browser/navigation_data.h"
 #include "content/public/browser/navigation_handle.h"
 
 namespace data_reduction_proxy {
 
 namespace internal {
 
 const char kHistogramFirstContentfulPaintDataReductionProxy[] =
-    "PageLoad.Clients.DataReductionProxy.Timing2."
+    "PageLoad.Clients.DataReductionProxy.PaintTiming."
     "NavigationToFirstContentfulPaint";
 const char kHistogramFirstContentfulPaintDataReductionProxyLoFiOn[] =
-    "PageLoad.Clients.DataReductionProxy.LoFiOn.Timing2."
+    "PageLoad.Clients.DataReductionProxy.LoFiOn.PaintTiming."
     "NavigationToFirstContentfulPaint";
 
 }  // namespace internal
 
 DataReductionProxyMetricsObserver::DataReductionProxyMetricsObserver()
     : lofi_requested_(false), used_data_reduction_proxy_(false) {}
 
 DataReductionProxyMetricsObserver::~DataReductionProxyMetricsObserver() {}
 
 // Check if the NavigationData indicates anything about the DataReductionProxy.
@@ skipping 10 matching lines @@
   if (!chrome_navigation_data)
     return;
   data_reduction_proxy::DataReductionProxyData* data =
       chrome_navigation_data->GetDataReductionProxyData();
   if (!data)
     return;
   used_data_reduction_proxy_ = data->used_data_reduction_proxy();
   lofi_requested_ = data->lofi_requested();
 }
 
-void DataReductionProxyMetricsObserver::OnComplete(
+void DataReductionProxyMetricsObserver::OnFirstContentfulPaint(
     const page_load_metrics::PageLoadTiming& timing,
     const page_load_metrics::PageLoadExtraInfo& info) {
-  RecordTimingHistograms(timing, info);
-}
-
-// Record first contentful paint UMA for various DataReductionProxy
-// configurations.
-void DataReductionProxyMetricsObserver::RecordTimingHistograms(
-    const page_load_metrics::PageLoadTiming& timing,
-    const page_load_metrics::PageLoadExtraInfo& info) const {
   if (!used_data_reduction_proxy_ ||
       !WasStartedInForegroundEventInForeground(timing.first_contentful_paint,
                                                info))
     return;
   PAGE_LOAD_HISTOGRAM(
       internal::kHistogramFirstContentfulPaintDataReductionProxy,
       timing.first_contentful_paint);
   if (!lofi_requested_)
     return;
   PAGE_LOAD_HISTOGRAM(
       internal::kHistogramFirstContentfulPaintDataReductionProxyLoFiOn,
       timing.first_contentful_paint);
 }
 
 }  // namespace data_reduction_proxy