Basic UkmService implementation

ios/chrome/browser/metrics/ios_chrome_metrics_service_client.h

 // 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.
 
 #ifndef IOS_CHROME_BROWSER_METRICS_IOS_CHROME_METRICS_SERVICE_CLIENT_H_
 #define IOS_CHROME_BROWSER_METRICS_IOS_CHROME_METRICS_SERVICE_CLIENT_H_
 
 #include <stdint.h>
 
 #include <memory>
+#include <set>
 #include <string>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/thread_checker.h"
 #include "components/metrics/metrics_service_client.h"
 #include "components/metrics/profiler/tracking_synchronizer_observer.h"
 #include "components/omnibox/browser/omnibox_event_global_tracker.h"
+#include "components/ukm/observers/history_delete_observer.h"
 #include "ios/web/public/web_state/global_web_state_observer.h"
 
 class IOSChromeStabilityMetricsProvider;
 class PrefRegistrySimple;
 
+namespace ios {
+class ChromeBrowserState;
+}
+
 namespace metrics {
 class DriveMetricsProvider;
 class MetricsService;
 class MetricsStateManager;
 class ProfilerMetricsProvider;
 }  // namespace metrics
 
+namespace ukm {
+class UkmService;
+}
+
 // IOSChromeMetricsServiceClient provides an implementation of
 // MetricsServiceClient that depends on //ios/chrome/.
 class IOSChromeMetricsServiceClient
     : public metrics::MetricsServiceClient,
       public metrics::TrackingSynchronizerObserver,
+      public ukm::HistoryDeleteObserver,
       public web::GlobalWebStateObserver {
  public:
   ~IOSChromeMetricsServiceClient() override;
 
   // Factory function.
   static std::unique_ptr<IOSChromeMetricsServiceClient> Create(
       metrics::MetricsStateManager* state_manager);
 
   // Registers local state prefs used by this class.
   static void RegisterPrefs(PrefRegistrySimple* registry);
 
   // metrics::MetricsServiceClient:
   metrics::MetricsService* GetMetricsService() override;
+  ukm::UkmService* GetUkmService() override;
   void SetMetricsClientId(const std::string& client_id) override;
   int32_t GetProduct() override;
   std::string GetApplicationLocale() override;
   bool GetBrand(std::string* brand_code) override;
   metrics::SystemProfileProto::Channel GetChannel() override;
   std::string GetVersionString() override;
   void InitializeSystemProfileMetrics(
       const base::Closure& done_callback) override;
   void CollectFinalMetricsForLog(const base::Closure& done_callback) override;
   std::unique_ptr<metrics::MetricsLogUploader> CreateUploader(
       const std::string& server_url,
       const std::string& mime_type,
       const base::Callback<void(int)>& on_upload_complete) override;
   base::TimeDelta GetStandardUploadInterval() override;
   base::string16 GetRegistryBackupKey() override;
   void OnRendererProcessCrash() override;
 
+  // ukm::HistoryDeleteObserver
+  void OnHistoryDeleted() override;
+
   // web::GlobalWebStateObserver:
   void WebStateDidStartLoading(web::WebState* web_state) override;
   void WebStateDidStopLoading(web::WebState* web_state) override;
 
   metrics::EnableMetricsDefault GetMetricsReportingDefaultState() override;
 
  private:
   explicit IOSChromeMetricsServiceClient(
       metrics::MetricsStateManager* state_manager);
 
@@ skipping 19 matching lines @@
   // Callbacks for various stages of final log info collection. Do not call
   // these directly.
   void CollectFinalHistograms();
 
   // Registers |this| as an observer for notifications which indicate that a
   // user is performing work. This is useful to allow some features to sleep,
   // until the machine becomes active, such as precluding UMA uploads unless
   // there was recent activity.
   void RegisterForNotifications();
 
+  // Register to observe history delete events on a browser state.
+  void RegisterForHistoryDeletions(ios::ChromeBrowserState* browser_state);
+
   // Called when a tab is parented.
   void OnTabParented(web::WebState* web_state);
 
   // Called when a URL is opened from the Omnibox.
   void OnURLOpenedFromOmnibox(OmniboxLog* log);
 
   base::ThreadChecker thread_checker_;
 
   // Weak pointer to the MetricsStateManager.
   metrics::MetricsStateManager* metrics_state_manager_;
 
   // The MetricsService that |this| is a client of.
   std::unique_ptr<metrics::MetricsService> metrics_service_;
 
+  // The UkmService that |this| is a client of.
+  std::unique_ptr<ukm::UkmService> ukm_service_;
+
   // The IOSChromeStabilityMetricsProvider instance that was registered with
   // MetricsService. Has the same lifetime as |metrics_service_|.
   IOSChromeStabilityMetricsProvider* stability_metrics_provider_;
 
   // Saved callback received from CollectFinalMetricsForLog().
   base::Closure collect_final_metrics_done_callback_;
 
   // The ProfilerMetricsProvider instance that was registered with
   // MetricsService. Has the same lifetime as |metrics_service_|.
   metrics::ProfilerMetricsProvider* profiler_metrics_provider_;
@@ skipping 20 matching lines @@
   // Whether this client has already uploaded profiler data during this session.
   // Profiler data is uploaded at most once per session.
   bool has_uploaded_profiler_data_;
 
   base::WeakPtrFactory<IOSChromeMetricsServiceClient> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(IOSChromeMetricsServiceClient);
 };
 
 #endif  // IOS_CHROME_BROWSER_METRICS_IOS_CHROME_METRICS_SERVICE_CLIENT_H_