Persist EffectiveConnectionType in UKM on navigation start.

chrome/browser/page_load_metrics/observers/ukm_page_load_metrics_observer.h

 // Copyright 2017 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.
 
 #ifndef CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_UKM_PAGE_LOAD_METRICS_OBSERVER_H_
 #define CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_UKM_PAGE_LOAD_METRICS_OBSERVER_H_
 
 #include "base/macros.h"
 #include "chrome/browser/page_load_metrics/page_load_metrics_observer.h"
+#include "net/nqe/network_quality_estimator.h"
+
+namespace content {
+class WebContents;
+}
 
 namespace internal {
 
 // Name constants are exposed here so they can be referenced from tests.
 extern const char kUkmPageLoadEventName[];
 extern const char kUkmParseStartName[];
 extern const char kUkmDomContentLoadedName[];
 extern const char kUkmLoadEventName[];
 extern const char kUkmFirstContentfulPaintName[];
 extern const char kUkmFirstMeaningfulPaintName[];
 extern const char kUkmForegroundDurationName[];
+extern const char kUkmEffectiveConnectionType[];
 
 }  // namespace internal
 
 // If URL-Keyed-Metrics (UKM) is enabled in the system, this is used to
 // populate it with top-level page-load metrics.
 class UkmPageLoadMetricsObserver
     : public page_load_metrics::PageLoadMetricsObserver {
  public:
   // Returns a UkmPageLoadMetricsObserver, or nullptr if it is not needed.
   static std::unique_ptr<page_load_metrics::PageLoadMetricsObserver>
-  CreateIfNeeded();
+  CreateIfNeeded(content::WebContents* web_contents);
 
-  UkmPageLoadMetricsObserver();
+  explicit UkmPageLoadMetricsObserver(
+      net::NetworkQualityEstimator::NetworkQualityProvider*
+          network_quality_provider);
   ~UkmPageLoadMetricsObserver() override;
 
   // page_load_metrics::PageLoadMetricsObserver implementation:
   ObservePolicy OnStart(content::NavigationHandle* navigation_handle,
                         const GURL& currently_committed_url,
                         bool started_in_foreground) override;
 
   ObservePolicy FlushMetricsOnAppEnterBackground(
       const page_load_metrics::PageLoadTiming& timing,
       const page_load_metrics::PageLoadExtraInfo& info) override;
@@ skipping 14 matching lines @@
   // as first contentful paint.
   void RecordTimingMetrics(const page_load_metrics::PageLoadTiming& timing);
 
   // Records metrics based on the PageLoadExtraInfo struct, as well as updating
   // the URL. |app_background_time| should be set to a timestamp if the app was
   // backgrounded, otherwise it should be set to a null TimeTicks.
   void RecordPageLoadExtraInfoMetrics(
       const page_load_metrics::PageLoadExtraInfo& info,
       base::TimeTicks app_background_time);
 
+  net::NetworkQualityEstimator::NetworkQualityProvider* const
+      network_quality_provider_;
+
   // Unique UKM identifier for the page load we are recording metrics for.
   const int32_t source_id_;
 
+  net::EffectiveConnectionType effective_connection_type_ =
+      net::EFFECTIVE_CONNECTION_TYPE_UNKNOWN;
+
   DISALLOW_COPY_AND_ASSIGN(UkmPageLoadMetricsObserver);
 };
 
 #endif  // CHROME_BROWSER_PAGE_LOAD_METRICS_OBSERVERS_UKM_PAGE_LOAD_METRICS_OBSERVER_H_