[Prerender] first contentful paint histograms.

chrome/browser/page_load_metrics/page_load_metrics_browsertest.cc

 // Copyright 2015 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 "base/files/scoped_temp_dir.h"
 #include "base/macros.h"
 #include "base/test/histogram_tester.h"
 #include "base/time/time.h"
 #include "chrome/browser/page_load_metrics/metrics_web_contents_observer.h"
 #include "chrome/browser/page_load_metrics/observers/aborts_page_load_metrics_observer.h"
@@ skipping 492 matching lines @@
 
 IN_PROC_BROWSER_TEST_F(PageLoadMetricsBrowserTest,
                        NoStatePrefetchObserverCacheable) {
   ASSERT_TRUE(embedded_test_server()->Start());
 
   ui_test_utils::NavigateToURL(browser(),
                                embedded_test_server()->GetURL("/title1.html"));
   NavigateToUntrackedUrl();
 
   histogram_tester_.ExpectTotalCount(
-      prerender::PrerenderHistograms::GetFirstContentfulPaintHistogramName(
-          prerender::ORIGIN_NONE, false, true, base::TimeDelta()),
-      0);
+      "Prerender.none_PrefetchTTFCP.Reference.NoStore.Visible", 0);
   histogram_tester_.ExpectTotalCount(
-      prerender::PrerenderHistograms::GetFirstContentfulPaintHistogramName(
-          prerender::ORIGIN_NONE, false, false, base::TimeDelta()),
-      1);
+      "Prerender.none_PrefetchTTFCP.Reference.Cacheable.Visible", 1);
 }
 
 IN_PROC_BROWSER_TEST_F(PageLoadMetricsBrowserTest,
                        NoStatePrefetchObserverNoStore) {
   ASSERT_TRUE(embedded_test_server()->Start());
 
   ui_test_utils::NavigateToURL(browser(),
                                embedded_test_server()->GetURL("/nostore.html"));
   NavigateToUntrackedUrl();
 
   histogram_tester_.ExpectTotalCount(
-      prerender::PrerenderHistograms::GetFirstContentfulPaintHistogramName(
-          prerender::ORIGIN_NONE, false, true, base::TimeDelta()),
-      1);
+      "Prerender.none_PrefetchTTFCP.Reference.NoStore.Visible", 1);
   histogram_tester_.ExpectTotalCount(
-      prerender::PrerenderHistograms::GetFirstContentfulPaintHistogramName(
-          prerender::ORIGIN_NONE, false, false, base::TimeDelta()),
-      0);
+      "Prerender.none_PrefetchTTFCP.Reference.Cacheable.Visible", 0);
 }
 
 IN_PROC_BROWSER_TEST_F(PageLoadMetricsBrowserTest, CSSTiming) {
   ASSERT_TRUE(embedded_test_server()->Start());
 
   // Careful: Blink code clamps timestamps to 5us, so any CSS parsing we do here
   // must take >> 5us, otherwise we'll log 0 for the value and it will remain
   // unset here.
   ui_test_utils::NavigateToURL(
       browser(),
       embedded_test_server()->GetURL("/page_load_metrics/page_with_css.html"));
   NavigateToUntrackedUrl();
 
   histogram_tester_.ExpectTotalCount(internal::kHistogramFirstContentfulPaint,
                                      1);
   histogram_tester_.ExpectTotalCount(
       "PageLoad.CSSTiming.Parse.BeforeFirstContentfulPaint", 1);
   histogram_tester_.ExpectTotalCount(
       "PageLoad.CSSTiming.Update.BeforeFirstContentfulPaint", 1);
   histogram_tester_.ExpectTotalCount(
       "PageLoad.CSSTiming.ParseAndUpdate.BeforeFirstContentfulPaint", 1);
 }