[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 33171bd52068c79c83b9d92ee6f6d5ff38a60685..25c47def88992e04d5e30a76851f3f3565e1dd19 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -53,6 +53,7 @@
 #include "chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.h"
 #include "chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings_factory.h"
 #include "chrome/browser/notifications/platform_notification_service_impl.h"
+#include "chrome/browser/page_load_metrics/metrics_navigation_throttle.h"
 #include "chrome/browser/password_manager/chrome_password_manager_client.h"
 #include "chrome/browser/permissions/permission_context_base.h"
 #include "chrome/browser/platform_util.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