[PageLoadMetrics] Don't record an ads histogram if the page hasn't committed

chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.cc

Index: chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.cc
diff --git a/chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.cc b/chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.cc
index 87cb8c46e4e03162569518ce28d2ec39c9218c05..e6159ec723aae1acfe0d07ed687667db6c1c55e3 100644
--- a/chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.cc
+++ b/chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.cc
@@ -187,6 +187,11 @@ PageLoadMetricsObserverTestHarness::histogram_tester() const {
   return histogram_tester_;
 }
 
+MetricsWebContentsObserver* PageLoadMetricsObserverTestHarness::observer()
+    const {
+  return observer_;
+}
+
 const PageLoadExtraInfo
 PageLoadMetricsObserverTestHarness::GetPageLoadExtraInfoForCommittedLoad() {
   return observer_->GetPageLoadExtraInfoForCommittedLoad();