Add an override flag to enable metrics reporting.

chrome/browser/metrics/chrome_metrics_services_manager_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 CHROME_BROWSER_METRICS_CHROME_METRICS_SERVICES_MANAGER_CLIENT_H_
 #define CHROME_BROWSER_METRICS_CHROME_METRICS_SERVICES_MANAGER_CLIENT_H_
 
 #include <memory>
 
 #include "base/feature_list.h"
@@ skipping 61 matching lines @@
   CreateEntropyProvider() override;
   net::URLRequestContextGetter* GetURLRequestContext() override;
   bool IsMetricsReportingEnabled() override;
   bool OnlyDoMetricsRecording() override;
 
 #if defined(OS_WIN)
   // On Windows, the client controls whether Crashpad can upload crash reports.
   void UpdateRunningServices(bool may_record, bool may_upload) override;
 #endif  // defined(OS_WIN)
 
+  bool IsMetricsReportingForceEnabled() override;
+
   // Gets the MetricsStateManager, creating it if it has not already been
   // created.
   metrics::MetricsStateManager* GetMetricsStateManager();
 
   // MetricsStateManager which is passed as a parameter to service constructors.
   std::unique_ptr<metrics::MetricsStateManager> metrics_state_manager_;
 
   // EnabledStateProvider to communicate if the client has consented to metrics
   // reporting, and if it's enabled.
   std::unique_ptr<metrics::EnabledStateProvider> enabled_state_provider_;
 
   // Ensures that all functions are called from the same thread.
   base::ThreadChecker thread_checker_;
 
   // Weak pointer to the local state prefs store.
   PrefService* local_state_;
 
 #if defined(OS_CHROMEOS)
   std::unique_ptr<chromeos::CrosSettings::ObserverSubscription>
       cros_settings_observer_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(ChromeMetricsServicesManagerClient);
 };
 
 #endif  // CHROME_BROWSER_METRICS_CHROME_METRICS_SERVICES_MANAGER_CLIENT_H_