Add PageLoad metrics for multi-tab loading cases

chrome/browser/page_load_metrics/page_load_metrics_initialize.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/page_load_metrics/page_load_metrics_initialize.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/macros.h"
@@ skipping 10 matching lines @@
 #include "chrome/browser/page_load_metrics/observers/css_scanning_page_load_metrics_observer.h"
 #include "chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.h"
 #include "chrome/browser/page_load_metrics/observers/delay_navigation_page_load_metrics_observer.h"
 #include "chrome/browser/page_load_metrics/observers/document_write_page_load_metrics_observer.h"
 #include "chrome/browser/page_load_metrics/observers/from_gws_page_load_metrics_observer.h"
 #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/loading_predictor_page_load_metrics_observer.h"
 #include "chrome/browser/page_load_metrics/observers/lofi_page_load_metrics_observer.h"
 #include "chrome/browser/page_load_metrics/observers/media_page_load_metrics_observer.h"
+#include "chrome/browser/page_load_metrics/observers/multi_tab_loading_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_suggestion_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"
 #include "chrome/browser/page_load_metrics/observers/service_worker_page_load_metrics_observer.h"
 #include "chrome/browser/page_load_metrics/observers/subresource_filter_metrics_observer.h"
 #include "chrome/browser/page_load_metrics/observers/tab_restore_page_load_metrics_observer.h"
 #include "chrome/browser/page_load_metrics/observers/ukm_page_load_metrics_observer.h"
 #include "chrome/browser/page_load_metrics/page_load_metrics_embedder_interface.h"
@@ skipping 45 matching lines @@
             data_reduction_proxy::DataReductionProxyMetricsObserver>());
     tracker->AddObserver(
         base::MakeUnique<data_reduction_proxy::LoFiPageLoadMetricsObserver>());
     tracker->AddObserver(base::MakeUnique<FromGWSPageLoadMetricsObserver>());
     tracker->AddObserver(
         base::MakeUnique<google_captcha_observer::GoogleCaptchaObserver>());
     tracker->AddObserver(
         base::MakeUnique<DocumentWritePageLoadMetricsObserver>());
     tracker->AddObserver(base::MakeUnique<MediaPageLoadMetricsObserver>());
     tracker->AddObserver(
+        base::MakeUnique<MultiTabLoadingPageLoadMetricsObserver>());
+    tracker->AddObserver(
         base::MakeUnique<previews::PreviewsPageLoadMetricsObserver>());
     tracker->AddObserver(
         base::MakeUnique<ServiceWorkerPageLoadMetricsObserver>());
     tracker->AddObserver(base::MakeUnique<SubresourceFilterMetricsObserver>());
     tracker->AddObserver(
         base::MakeUnique<HttpsEngagementPageLoadMetricsObserver>(
             web_contents_->GetBrowserContext()));
     tracker->AddObserver(base::MakeUnique<CssScanningMetricsObserver>());
     tracker->AddObserver(base::MakeUnique<ProtocolPageLoadMetricsObserver>());
     tracker->AddObserver(base::MakeUnique<TabRestorePageLoadMetricsObserver>());
@@ skipping 57 matching lines @@
 
 void InitializePageLoadMetricsForWebContents(
     content::WebContents* web_contents,
     const base::Optional<content::WebContents::CreateParams>& create_params) {
   page_load_metrics::MetricsWebContentsObserver::CreateForWebContents(
       web_contents, create_params,
       base::MakeUnique<PageLoadMetricsEmbedder>(web_contents));
 }
 
 }  // namespace chrome