[Metrics] Move non-idle notifications from MetricsService to ChromeMetricsServiceClient

chrome/browser/metrics/chrome_metrics_service_client.h

 // Copyright 2014 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_METRICS_CHROME_METRICS_SERVICE_CLIENT_H_
 #define CHROME_BROWSER_METRICS_CHROME_METRICS_SERVICE_CLIENT_H_
 
 #include <string>
 
 #include "base/basictypes.h"
+#include "base/threading/thread_checker.h"
 #include "components/metrics/metrics_service_client.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+
+class MetricsService;
 
 // ChromeMetricsServiceClient provides an implementation of MetricsServiceClient
 // that depends on chrome/.
-class ChromeMetricsServiceClient : public metrics::MetricsServiceClient {
+class ChromeMetricsServiceClient : public metrics::MetricsServiceClient,
+                                   public content::NotificationObserver {
  public:
   ChromeMetricsServiceClient();
   virtual ~ChromeMetricsServiceClient();
 
   // metrics::MetricsServiceClient:
   virtual void SetClientID(const std::string& client_id) OVERRIDE;
   virtual bool IsOffTheRecordSessionActive() OVERRIDE;
   virtual std::string GetApplicationLocale() OVERRIDE;
   virtual bool GetBrand(std::string* brand_code) OVERRIDE;
   virtual metrics::SystemProfileProto::Channel GetChannel() OVERRIDE;
   virtual std::string GetVersionString() OVERRIDE;
 
+  // Stores a weak pointer to the given |service|.
+  // TODO(isherman): Fix the memory ownership model so that this method is not
+  // needed: http://crbug.com/375248
+  void set_service(MetricsService* service) { service_ = service; }
+
  private:
+  // 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();
+
+  // content::NotificationObserver:
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+  // The MetricsService that |this| is a client of. Weak pointer.
+  MetricsService* service_;
+
+  content::NotificationRegistrar registrar_;
+  base::ThreadChecker thread_checker_;
+
   DISALLOW_COPY_AND_ASSIGN(ChromeMetricsServiceClient);
 };
 
 #endif  // CHROME_BROWSER_METRICS_CHROME_METRICS_SERVICE_CLIENT_H_