Fix name for UKM parse start metric.

chrome/browser/page_load_metrics/observers/ukm_page_load_metrics_observer.cc

 // Copyright 2017 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/ukm_page_load_metrics_observer.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/page_load_metrics/page_load_metrics_util.h"
 #include "components/ukm/ukm_entry_builder.h"
 #include "components/ukm/ukm_service.h"
 
 namespace internal {
 
 const char kUkmPageLoadEventName[] = "PageLoad";
-const char kUkmParseStartName[] = "ParseTiming.ParseStart";
+const char kUkmParseStartName[] = "ParseTiming.NavigationToParseStart";
 const char kUkmDomContentLoadedName[] =
     "DocumentTiming.NavigationToDOMContentLoadedEventFired";
 const char kUkmLoadEventName[] = "DocumentTiming.NavigationToLoadEventFired";
 const char kUkmFirstContentfulPaintName[] =
     "PaintTiming.NavigationToFirstContentfulPaint";
 const char kUkmFirstMeaningfulPaintName[] =
     "Experimental.PaintTiming.NavigationToFirstMeaningfulPaint";
 const char kUkmForegroundDurationName[] = "PageTiming.ForegroundDuration";
 
 }  // namespace internal
@@ skipping 96 matching lines @@
       page_load_metrics::GetInitialForegroundDuration(info,
                                                       app_background_time);
   if (foreground_duration) {
     std::unique_ptr<ukm::UkmEntryBuilder> builder =
         ukm_service->GetEntryBuilder(source_id_,
                                      internal::kUkmPageLoadEventName);
     builder->AddMetric(internal::kUkmForegroundDurationName,
                        foreground_duration.value().InMilliseconds());
   }
 }