Remove WallpaperManager dependency on Cryptohome.

chromeos/cryptohome/system_salt_getter.h

 // Copyright (c) 2012 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 CHROMEOS_CRYPTOHOME_SYSTEM_SALT_GETTER_H_
 #define CHROMEOS_CRYPTOHOME_SYSTEM_SALT_GETTER_H_
 
 #include <stdint.h>
 
 #include <string>
 #include <vector>
 
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "chromeos/chromeos_export.h"
 #include "chromeos/dbus/dbus_method_call_status.h"
 
 namespace chromeos {
 
 // This class is used to get the system salt from cryptohome and cache it.
 class CHROMEOS_EXPORT SystemSaltGetter {
  public:
   typedef base::Callback<void(const std::string& system_salt)>
       GetSystemSaltCallback;
 
+  using RawSalt = std::vector<uint8_t>;
+
   // Manage an explicitly initialized global instance.
   static void Initialize();
   static bool IsInitialized();
   static void Shutdown();
   static SystemSaltGetter* Get();
 
   // Converts |salt| to a hex encoded string.
-  static std::string ConvertRawSaltToHexString(
-      const std::vector<uint8_t>& salt);
+  static std::string ConvertRawSaltToHexString(const RawSalt& salt);
 
   // Returns system hash in hex encoded ascii format. Note: this may return
   // an empty string (e.g. errors in D-Bus layer)
   void GetSystemSalt(const GetSystemSaltCallback& callback);
 
+  // Returns pointer to binary system salt if it is already known.
+  // Returns nullptr if system salt is not known.
+  const SystemSaltGetter::RawSalt* GetRawSalt() const;

[Darren Krahn, 2016/04/13 16:33:44]

nit: SystemSaltGetter:: not necessary

[Alexander Alekseev, 2016/04/14 03:37:29]

Done.

+
+  // This is for browser tests API.
+  void SetRawSaltForTesting(const SystemSaltGetter::RawSalt& raw_salt);

[Darren Krahn, 2016/04/13 16:33:43]

nit: Here too

[Alexander Alekseev, 2016/04/14 03:37:29]

Done.

+
  protected:
   SystemSaltGetter();
   ~SystemSaltGetter();
 
  private:
   // Used to implement GetSystemSalt().
   void DidWaitForServiceToBeAvailable(const GetSystemSaltCallback& callback,
                                       bool service_is_available);
   void DidGetSystemSalt(const GetSystemSaltCallback& callback,
                         DBusMethodCallStatus call_status,
-                        const std::vector<uint8_t>& system_salt);
+                        const RawSalt& system_salt);
 
+  RawSalt raw_salt_;
   std::string system_salt_;
 
   base::WeakPtrFactory<SystemSaltGetter> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemSaltGetter);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_CRYPTOHOME_SYSTEM_SALT_GETTER_H_