Make PageLoadMetricsObserver::OnStart return ObservePolicy

chrome/browser/page_load_metrics/page_load_metrics_observer.cc

Index: chrome/browser/page_load_metrics/page_load_metrics_observer.cc
diff --git a/chrome/browser/page_load_metrics/page_load_metrics_observer.cc b/chrome/browser/page_load_metrics/page_load_metrics_observer.cc
index 3b9d48fa88d420674a3d79ba0f4be2d5c39728d9..04fc547986fbfd340a2130249eccd513f6006d45 100644
--- a/chrome/browser/page_load_metrics/page_load_metrics_observer.cc
+++ b/chrome/browser/page_load_metrics/page_load_metrics_observer.cc
@@ -44,6 +44,13 @@ FailedProvisionalLoadInfo::FailedProvisionalLoadInfo(base::TimeDelta interval,
 
 FailedProvisionalLoadInfo::~FailedProvisionalLoadInfo() {}
 
+PageLoadMetricsObserver::ObservePolicy PageLoadMetricsObserver::OnStart(
+    content::NavigationHandle* navigation_handle,
+    const GURL& currently_committed_url,
+    bool started_in_foreground) {
+  return CONTINUE_OBSERVING;
+}
+
 PageLoadMetricsObserver::ObservePolicy PageLoadMetricsObserver::OnCommit(
     content::NavigationHandle* navigation_handle) {
   return CONTINUE_OBSERVING;