Add signal handler for low disk notification

chromeos/dbus/fake_cryptohome_client.cc

 // 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.
 
 #include "chromeos/dbus/fake_cryptohome_client.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/bind.h"
@@ skipping 34 matching lines @@
     const AsyncCallStatusWithDataHandler& data_handler) {
   async_call_status_handler_ = handler;
   async_call_status_data_handler_ = data_handler;
 }
 
 void FakeCryptohomeClient::ResetAsyncCallStatusHandlers() {
   async_call_status_handler_.Reset();
   async_call_status_data_handler_.Reset();
 }
 
+void FakeCryptohomeClient::SetLowDiskSpaceHandler(
+    const LowDiskSpaceHandler& handler) {}
+
 void FakeCryptohomeClient::WaitForServiceToBeAvailable(
     const WaitForServiceToBeAvailableCallback& callback) {
   if (service_is_available_) {
     base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
                                                   base::Bind(callback, true));
   } else {
     pending_wait_for_service_to_be_available_callbacks_.push_back(callback);
   }
 }
 
@@ skipping 527 matching lines @@
                               cryptohome::MOUNT_ERROR_NONE));
   } else if (returns_data && !async_call_status_data_handler_.is_null()) {
     base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE, base::Bind(async_call_status_data_handler_, async_call_id_,
                               true, std::string()));
   }
   ++async_call_id_;
 }
 
 }  // namespace chromeos