Move statistics_provider to chromeos/system

chromeos/system/statistics_provider.h

 // Copyright (c) 2011 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_CHROMEOS_SYSTEM_STATISTICS_PROVIDER_H_
-#define CHROME_BROWSER_CHROMEOS_SYSTEM_STATISTICS_PROVIDER_H_
+#ifndef CHROMEOS_SYSTEM_STATISTICS_PROVIDER_H_
+#define CHROMEOS_SYSTEM_STATISTICS_PROVIDER_H_
 
 #include <string>
 
+#include "base/memory/ref_counted.h"
+#include "chromeos/chromeos_export.h"
+
+namespace base {
+class TaskRunner;
+}
+
 namespace chromeos {
 namespace system {
 
 // Developer switch value.
-extern const char kDevSwitchBootMode[];
+CHROMEOS_EXPORT extern const char kDevSwitchBootMode[];
 
 // HWID key.
-extern const char kHardwareClass[];
+CHROMEOS_EXPORT extern const char kHardwareClassKey[];
 
 // OEM customization flag that permits exiting enterprise enrollment flow in
 // OOBE when 'oem_enterprise_managed' flag is set.
-extern const char kOemCanExitEnterpriseEnrollmentKey[];
+CHROMEOS_EXPORT extern const char kOemCanExitEnterpriseEnrollmentKey[];
 
 // OEM customization directive that specified intended device purpose.
-extern const char kOemDeviceRequisitionKey[];
+CHROMEOS_EXPORT extern const char kOemDeviceRequisitionKey[];
 
 // OEM customization flag that enforces enterprise enrollment flow in OOBE.
-extern const char kOemIsEnterpriseManagedKey[];
+CHROMEOS_EXPORT extern const char kOemIsEnterpriseManagedKey[];
 
 // OEM customization flag that specifies if OOBE flow should be enhanced for
 // keyboard driven control.
-extern const char kOemKeyboardDrivenOobeKey[];
+CHROMEOS_EXPORT extern const char kOemKeyboardDrivenOobeKey[];
 
 // Offer coupon code key.
-extern const char kOffersCouponCodeKey[];
+CHROMEOS_EXPORT extern const char kOffersCouponCodeKey[];
 
 // Offer group key.
-extern const char kOffersGroupCodeKey[];
+CHROMEOS_EXPORT extern const char kOffersGroupCodeKey[];
 
 // This interface provides access to Chrome OS statistics.
-class StatisticsProvider {
+class CHROMEOS_EXPORT StatisticsProvider {
  public:
-  // Initializes the statistics provider.
-  virtual void Init() = 0;
+  // Starts loading the machine statistics.
+  virtual void StartLoadingMachineStatistics(bool load_oem_manifest) = 0;
 
-  // Starts loading the machine statistcs.
-  virtual void StartLoadingMachineStatistics() = 0;
-
-  // Retrieve the named machine statistic (e.g. "hardware_class").
-  // This does not update the statistcs. If the |name| is not set, |result|
-  // preserves old value.
+  // Retrieves the named machine statistic (e.g. "hardware_class"). If |name|
+  // is found, sets |result| and returns true. Safe to call from any thread
+  // except the task runner passed to Initialize() (e.g. FILE). This may block
+  // if called early before the statistics are loaded from disk.
+  // StartLoadingMachineStatistics() must be called before this.
   virtual bool GetMachineStatistic(const std::string& name,
                                    std::string* result) = 0;
 
-  // Retrieve boolean value for named machine flag.
-  virtual bool GetMachineFlag(const std::string& name,
-                              bool* result) = 0;
+  // Similar to GetMachineStatistic for boolean flags.
+  virtual bool GetMachineFlag(const std::string& name, bool* result) = 0;
 
-  // Loads kiosk oem manifest file.
-  virtual void LoadOemManifest() = 0;
-
+  // Manage the singleton. Initialize must be called before GetInstance.
+  // |file_task_runner| is a task runner for loading files off of disk.
+  static void Initialize(
+      const scoped_refptr<base::TaskRunner>& file_task_runner);
+  static void Shutdown();
   static StatisticsProvider* GetInstance();
 
  protected:
   virtual ~StatisticsProvider() {}
 };
 
 }  // namespace system
 }  // namespace chromeos
 
-#endif  // CHROME_BROWSER_CHROMEOS_SYSTEM_STATISTICS_PROVIDER_H_
+#endif  // CHROMEOS_SYSTEM_STATISTICS_PROVIDER_H_