Define a few simple UMA metrics for the component updater.

components/component_updater/component_updater_service_internal.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 COMPONENTS_COMPONENT_UPDATER_COMPONENT_UPDATER_SERVICE_INTERNAL_H_
 #define COMPONENTS_COMPONENT_UPDATER_COMPONENT_UPDATER_SERVICE_INTERNAL_H_
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/sequenced_task_runner.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_checker.h"
 #include "components/component_updater/timer.h"
 
+namespace base {
+class TimeTicks;
+}
+
 namespace component_updater {
 
 class OnDemandUpdater;
 
 using CrxInstaller = update_client::CrxInstaller;
 using UpdateClient = update_client::UpdateClient;
 
 class CrxUpdateService : public ComponentUpdateService,
                          public ComponentUpdateService::Observer,
                          public OnDemandUpdater {
   using Observer = ComponentUpdateService::Observer;
 
  public:
   CrxUpdateService(const scoped_refptr<Configurator>& config,
                    const scoped_refptr<UpdateClient>& update_client);
   ~CrxUpdateService() override;
 
   // Overrides for ComponentUpdateService.
   void AddObserver(Observer* observer) override;
   void RemoveObserver(Observer* observer) override;
   bool RegisterComponent(const CrxComponent& component) override;
   bool UnregisterComponent(const std::string& id) override;
   std::vector<std::string> GetComponentIDs() const override;
   OnDemandUpdater& GetOnDemandUpdater() override;
   void MaybeThrottle(const std::string& id,
                      const base::Closure& callback) override;
   scoped_refptr<base::SequencedTaskRunner> GetSequencedTaskRunner() override;
-  bool OnDemandUpdate(const std::string& id) override;
   bool GetComponentDetails(const std::string& id,
                            CrxUpdateItem* item) const override;
 
   // Overrides for Observer.
   void OnEvent(Events event, const std::string& id) override;
 
+  // Overrides for OnDemandUpdater.
+  bool OnDemandUpdate(const std::string& id) override;
+
  private:
   void Start();
   void Stop();
 
   bool CheckForUpdates();
 
   bool OnDemandUpdateInternal(const std::string& id);
   bool OnDemandUpdateWithCooldown(const std::string& id);
 
   bool DoUnregisterComponent(const CrxComponent& component);
 
   const CrxComponent* GetComponent(const std::string& id) const;
 
   const CrxUpdateItem* GetComponentState(const std::string& id) const;
 
   void OnUpdate(const std::vector<std::string>& ids,
                 std::vector<CrxComponent>* components);
-  void OnUpdateComplete(int error);
+  void OnUpdateComplete(const base::TimeTicks& start_time, int error);
 
   base::ThreadChecker thread_checker_;
 
   scoped_refptr<Configurator> config_;
 
   scoped_refptr<UpdateClient> update_client_;
 
   Timer timer_;
 
   // A collection of every registered component.
@@ skipping 21 matching lines @@
   ComponentStates component_states_;
 
   scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(CrxUpdateService);
 };
 
 }  // namespace component_updater
 
 #endif  // COMPONENTS_COMPONENT_UPDATER_COMPONENT_UPDATER_SERVICE_INTERNAL_H_