Add UKM metric tracking for various page load metric observers.

services/metrics/public/cpp/ukm_recorder.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 SERVICES_METRICS_PUBLIC_CPP_UKM_RECORDER_H_
 #define SERVICES_METRICS_PUBLIC_CPP_UKM_RECORDER_H_
 
 #include <stddef.h>
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/feature_list.h"
 #include "base/macros.h"
 #include "base/threading/thread_checker.h"
 #include "services/metrics/public/cpp/metrics_export.h"
 #include "services/metrics/public/cpp/ukm_entry_builder.h"
 #include "services/metrics/public/interfaces/ukm_interface.mojom.h"
 #include "url/gurl.h"
 
 class ContextualSearchRankerLoggerImpl;
+class DocumentWritePageLoadMetricsObserver;
+class FromGWSPageLoadMetricsLogger;
 class PluginInfoMessageFilter;
+class ServiceWorkerPageLoadMetricsObserver;
+class SubresourceFilterMetricsObserver;
 class UkmPageLoadMetricsObserver;
 
 namespace autofill {
 class AutofillMetrics;
 }
 
 namespace content {
 class MediaInternals;
 class RenderFrameImpl;
 class RenderWidgetHostLatencyTracker;
@@ skipping 50 matching lines @@
   // Update the URL on the source keyed to the given source ID. If the source
   // does not exist, it will create a new UkmSource object.
   virtual void UpdateSourceURL(SourceId source_id, const GURL& url) = 0;
 
  private:
   friend autofill::AutofillMetrics;
   friend payments::JourneyLogger;
   friend ContextualSearchRankerLoggerImpl;
   friend PluginInfoMessageFilter;
   friend UkmPageLoadMetricsObserver;
+  friend DocumentWritePageLoadMetricsObserver;
+  friend FromGWSPageLoadMetricsLogger;
+  friend ServiceWorkerPageLoadMetricsObserver;
+  friend SubresourceFilterMetricsObserver;
   friend translate::TranslateRankerImpl;
   friend TestRecordingHelper;
   friend UkmInterface;
   friend content::MediaInternals;
   friend content::RenderFrameImpl;
   friend content::RenderWidgetHostLatencyTracker;
   friend password_manager::PasswordManagerMetricsRecorder;
   friend password_manager::PasswordFormMetricsRecorder;
   friend resource_coordinator::CoordinationUnitManager;
   FRIEND_TEST_ALL_PREFIXES(UkmServiceTest, AddEntryWithEmptyMetrics);
@@ skipping 16 matching lines @@
  private:
   // Add an entry to the UkmEntry list.
   virtual void AddEntry(mojom::UkmEntryPtr entry) = 0;
 
   DISALLOW_COPY_AND_ASSIGN(UkmRecorder);
 };
 
 }  // namespace ukm
 
 #endif  // SERVICES_METRICS_PUBLIC_CPP_UKM_RECORDER_H_