[page_load_metrics] Add a NavigationThrottle for richer abort metrics

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index f8af92a04931b0c22929199aa1e70f96b6998325..03331d401509e8028679626f08741799ea44f866 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -125,6 +125,7 @@
 #include "components/google/core/browser/google_util.h"
 #include "components/metrics/client_info.h"
 #include "components/net_log/chrome_net_log.h"
+#include "components/page_load_metrics/browser/metrics_navigation_throttle.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "components/prefs/pref_service.h"
 #include "components/prefs/scoped_user_pref_update.h"
@@ -2974,6 +2975,11 @@ ChromeContentBrowserClient::CreateThrottlesForNavigation(
     throttles.push_back(new extensions::ExtensionNavigationThrottle(handle));
 #endif
 
+  if (handle->IsInMainFrame()) {
+    throttles.push_back(
+        page_load_metrics::MetricsNavigationThrottle::Create(handle));
+  }
+
   return throttles;
 }