[Page Load Metrics] Add page load metrics for omnibox.

chrome/browser/page_load_metrics/page_load_metrics_initialize.cc

Index: chrome/browser/page_load_metrics/page_load_metrics_initialize.cc
diff --git a/chrome/browser/page_load_metrics/page_load_metrics_initialize.cc b/chrome/browser/page_load_metrics/page_load_metrics_initialize.cc
index 3af2ffdd7c944087f97252bee700dfd963bb1a8a..6634119821d6d4f059c007aeb3aa23542376847b 100644
--- a/chrome/browser/page_load_metrics/page_load_metrics_initialize.cc
+++ b/chrome/browser/page_load_metrics/page_load_metrics_initialize.cc
@@ -20,6 +20,7 @@
 #include "chrome/browser/page_load_metrics/observers/google_captcha_observer.h"
 #include "chrome/browser/page_load_metrics/observers/https_engagement_metrics/https_engagement_page_load_metrics_observer.h"
 #include "chrome/browser/page_load_metrics/observers/no_state_prefetch_page_load_metrics_observer.h"
+#include "chrome/browser/page_load_metrics/observers/omnibox_suggested_used_page_load_metrics_observer.h"
 #include "chrome/browser/page_load_metrics/observers/prerender_page_load_metrics_observer.h"
 #include "chrome/browser/page_load_metrics/observers/previews_page_load_metrics_observer.h"
 #include "chrome/browser/page_load_metrics/observers/protocol_page_load_metrics_observer.h"
@@ -90,6 +91,8 @@ void PageLoadMetricsEmbedder::RegisterObservers(
     tracker->AddObserver(base::MakeUnique<CssScanningMetricsObserver>());
     tracker->AddObserver(base::MakeUnique<ProtocolPageLoadMetricsObserver>());
     tracker->AddObserver(base::MakeUnique<TabRestorePageLoadMetricsObserver>());
+    tracker->AddObserver(
+        base::MakeUnique<OmniboxSuggestedUsedMetricsObserver>());
 
     std::unique_ptr<page_load_metrics::PageLoadMetricsObserver> ukm_observer =
         UkmPageLoadMetricsObserver::CreateIfNeeded();