Add signal handler for low disk notification

chromeos/dbus/fake_cryptohome_client.h

 // Copyright 2013 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_DBUS_FAKE_CRYPTOHOME_CLIENT_H_
 #define CHROMEOS_DBUS_FAKE_CRYPTOHOME_CLIENT_H_
 
 #include <stdint.h>
 
 #include <map>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "chromeos/dbus/cryptohome_client.h"
 
 namespace chromeos {
 
 class CHROMEOS_EXPORT FakeCryptohomeClient : public CryptohomeClient {
  public:
   FakeCryptohomeClient();
   ~FakeCryptohomeClient() override;
 
   void Init(dbus::Bus* bus) override;
   void SetAsyncCallStatusHandlers(
       const AsyncCallStatusHandler& handler,
       const AsyncCallStatusWithDataHandler& data_handler) override;
   void ResetAsyncCallStatusHandlers() override;
+  void SetLowDiskSpaceHandler(const LowDiskSpaceHandler& handler) override;
   void WaitForServiceToBeAvailable(
       const WaitForServiceToBeAvailableCallback& callback) override;
   void IsMounted(const BoolDBusMethodCallback& callback) override;
   bool Unmount(bool* success) override;
   void AsyncCheckKey(const cryptohome::Identification& cryptohome_id,
                      const std::string& key,
                      const AsyncMethodCallback& callback) override;
   void AsyncMigrateKey(const cryptohome::Identification& cryptohome_id,
                        const std::string& from_key,
                        const std::string& to_key,
@@ skipping 201 matching lines @@
   std::map<std::string, std::vector<uint8_t>> install_attrs_;
   bool locked_;
   base::WeakPtrFactory<FakeCryptohomeClient> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeCryptohomeClient);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_FAKE_CRYPTOHOME_CLIENT_H_