Storage manager: Show the disk usage of other users.

chromeos/cryptohome/homedir_methods.h

Index: chromeos/cryptohome/homedir_methods.h
diff --git a/chromeos/cryptohome/homedir_methods.h b/chromeos/cryptohome/homedir_methods.h
index 3f40f4a45afdc7283f282a3abffd7e3d6c150b5c..2117e50ab62a95ef3775d50e1b5a9bce22686b91 100644
--- a/chromeos/cryptohome/homedir_methods.h
+++ b/chromeos/cryptohome/homedir_methods.h
@@ -30,6 +30,8 @@ class CHROMEOS_EXPORT HomedirMethods {
   typedef base::Callback<
       void(bool success, MountError return_code, const std::string& mount_hash)>
       MountCallback;
+  typedef base::Callback<void(bool success, int64_t size)>
+      GetAccountDiskUsageCallback;
 
   virtual ~HomedirMethods() {}
 
@@ -95,6 +97,12 @@ class CHROMEOS_EXPORT HomedirMethods {
                                 const Identification& id_to,
                                 const Callback& callback) = 0;
 
+  // Asks cryptohomed to compute the size of cryptohome for user identified by
+  // |id|.
+  virtual void GetAccountDiskUsage(
+      const Identification& id,
+      const GetAccountDiskUsageCallback& callback) = 0;
+
   // Creates the global HomedirMethods instance.
   static void Initialize();