[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 64036022fb276951403b1cccbbb2cb1c4f24d8a3..bea621a69ec3b676680e1ebe1233469c4284c5cc 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"
@@ -2905,6 +2906,11 @@ ScopedVector<content::NavigationThrottle>
 ChromeContentBrowserClient::CreateThrottlesForNavigation(
     content::NavigationHandle* handle) {
   ScopedVector<content::NavigationThrottle> throttles;
+  if (handle->IsInMainFrame()) {
+    throttles.push_back(
+        page_load_metrics::MetricsNavigationThrottle::Create(handle));
+  }
+
 #if defined(OS_ANDROID)
   // TODO(davidben): This is insufficient to integrate with prerender properly.
   // https://crbug.com/370595