Persist EffectiveConnectionType in UKM on navigation start.

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 "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "chrome/browser/page_load_metrics/metrics_web_contents_observer.h"
 #if defined(OS_ANDROID)
@@ skipping 74 matching lines @@
         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>());
 
     std::unique_ptr<page_load_metrics::PageLoadMetricsObserver> ukm_observer =
-        UkmPageLoadMetricsObserver::CreateIfNeeded();
+        UkmPageLoadMetricsObserver::CreateIfNeeded(web_contents_);
     if (ukm_observer)
       tracker->AddObserver(std::move(ukm_observer));
 
     std::unique_ptr<page_load_metrics::PageLoadMetricsObserver>
         no_state_prefetch_observer =
             NoStatePrefetchPageLoadMetricsObserver::CreateIfNeeded(
                 web_contents_);
     if (no_state_prefetch_observer)
       tracker->AddObserver(std::move(no_state_prefetch_observer));
 #if defined(OS_ANDROID)
@@ skipping 30 matching lines @@
 
 }  // namespace
 
 void InitializePageLoadMetricsForWebContents(
     content::WebContents* web_contents) {
   page_load_metrics::MetricsWebContentsObserver::CreateForWebContents(
       web_contents, base::MakeUnique<PageLoadMetricsEmbedder>(web_contents));
 }
 
 }  // namespace chrome