Add metric with time between background tab being foregrounded and the first paint

chrome/browser/page_load_metrics/observers/aborts_page_load_metrics_observer.cc

Index: chrome/browser/page_load_metrics/observers/aborts_page_load_metrics_observer.cc
diff --git a/chrome/browser/page_load_metrics/observers/aborts_page_load_metrics_observer.cc b/chrome/browser/page_load_metrics/observers/aborts_page_load_metrics_observer.cc
index 3258129f49ca366ff42a88d6cf44726da6aaa603..4c101f6009c02663d45ae3a1f911a2ca88a14461 100644
--- a/chrome/browser/page_load_metrics/observers/aborts_page_load_metrics_observer.cc
+++ b/chrome/browser/page_load_metrics/observers/aborts_page_load_metrics_observer.cc
@@ -11,7 +11,7 @@ using page_load_metrics::UserAbortType;
 namespace {
 
 void RecordAbortBeforeCommit(UserAbortType abort_type,
-                             const base::TimeDelta& time_to_abort) {
+                             base::TimeDelta time_to_abort) {
   switch (abort_type) {
     case UserAbortType::ABORT_RELOAD:
       PAGE_LOAD_HISTOGRAM(internal::kHistogramAbortReloadBeforeCommit,
@@ -51,7 +51,7 @@ void RecordAbortBeforeCommit(UserAbortType abort_type,
 }
 
 void RecordAbortAfterCommitBeforePaint(UserAbortType abort_type,
-                                       const base::TimeDelta& time_to_abort) {
+                                       base::TimeDelta time_to_abort) {
   switch (abort_type) {
     case UserAbortType::ABORT_RELOAD:
       PAGE_LOAD_HISTOGRAM(internal::kHistogramAbortReloadBeforePaint,
@@ -128,11 +128,11 @@ void AbortsPageLoadMetricsObserver::OnComplete(
   if (abort_type == UserAbortType::ABORT_NONE)
     return;
 
-  const base::TimeDelta& time_to_abort = extra_info.time_to_abort;
+  base::TimeDelta time_to_abort = extra_info.time_to_abort;
   DCHECK(!time_to_abort.is_zero());
 
   // Don't log abort times if the page was backgrounded before the abort event.
-  if (!EventOccurredInForeground(time_to_abort, extra_info))
+  if (!WasStartedInForegroundEventInForeground(time_to_abort, extra_info))
     return;
 
   if (extra_info.time_to_commit.is_zero()) {