Storage manager: Show the disk usage of other users.

chromeos/dbus/fake_cryptohome_client.h

Index: chromeos/dbus/fake_cryptohome_client.h
diff --git a/chromeos/dbus/fake_cryptohome_client.h b/chromeos/dbus/fake_cryptohome_client.h
index b52751657d2f41a41b9c1d9c02232a7387be175e..02dece263f323ff5a71e36b183925ef21a9d9f0b 100644
--- a/chromeos/dbus/fake_cryptohome_client.h
+++ b/chromeos/dbus/fake_cryptohome_client.h
@@ -42,6 +42,8 @@ class CHROMEOS_EXPORT FakeCryptohomeClient : public CryptohomeClient {
   void RenameCryptohome(const cryptohome::Identification& cryptohome_id_from,
                         const cryptohome::Identification& cryptohome_id_to,
                         const ProtobufMethodCallback& callback) override;
+  void GetAccountDiskUsage(const cryptohome::Identification& account_id,
+                           const ProtobufMethodCallback& callback) override;
   void GetSystemSalt(const GetSystemSaltCallback& callback) override;
   void GetSanitizedUsername(const cryptohome::Identification& cryptohome_id,
                             const StringDBusMethodCallback& callback) override;