Adding previews information to PLM UKM

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>
@@ skipping 37 matching lines @@
 
 namespace payments {
 class JourneyLogger;
 }
 
 namespace password_manager {
 class PasswordManagerMetricsRecorder;
 class PasswordFormMetricsRecorder;
 }  // namespace password_manager
 
+namespace previews {
+class PreviewsUKMObserver;
+}
+
 namespace ukm {
 
 class UkmEntryBuilder;
 class UkmInterface;
 class TestRecordingHelper;
 
 // This feature controls whether UkmService should be created.
 METRICS_EXPORT extern const base::Feature kUkmFeature;
 
 typedef int64_t SourceId;
@@ skipping 35 matching lines @@
   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 previews::PreviewsUKMObserver;
   friend resource_coordinator::CoordinationUnitManager;
   FRIEND_TEST_ALL_PREFIXES(UkmServiceTest, AddEntryWithEmptyMetrics);
   FRIEND_TEST_ALL_PREFIXES(UkmServiceTest, EntryBuilderAndSerialization);
   FRIEND_TEST_ALL_PREFIXES(UkmServiceTest,
                            LogsUploadedOnlyWhenHavingSourcesOrEntries);
   FRIEND_TEST_ALL_PREFIXES(UkmServiceTest, MetricsProviderTest);
   FRIEND_TEST_ALL_PREFIXES(UkmServiceTest, PersistAndPurge);
   FRIEND_TEST_ALL_PREFIXES(UkmServiceTest, WhitelistEntryTest);
 
   // Get a new UkmEntryBuilder object for the specified source ID and event,
   // which can get metrics added to.
   //
   // This API being private is intentional. Any client using UKM needs to
   // declare itself to be a friend of UkmService and go through code review
   // process.
   std::unique_ptr<UkmEntryBuilder> GetEntryBuilder(SourceId source_id,
                                                    const char* event_name);
 
  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_