Extend system monitor capacity for watching the free space changes

base/system_monitor/system_monitor.cc

 // 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.
 
 #include "base/system_monitor/system_monitor.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/message_loop.h"
@@ skipping 133 matching lines @@
 void SystemMonitor::RemoveDevicesChangedObserver(DevicesChangedObserver* obs) {
   devices_changed_observer_list_->RemoveObserver(obs);
 }
 
 void SystemMonitor::NotifyDevicesChanged(DeviceType device_type) {
   DVLOG(1) << "DevicesChanged with device type " << device_type;
   devices_changed_observer_list_->Notify(
       &DevicesChangedObserver::OnDevicesChanged, device_type);
 }
 
+void SystemMonitor::NotifyStorageFreeSpaceChanged(
+    const FilePath::StringType& path, double available_capacity) {
+  DVLOG(1) << "StorageFreeSpaceChanged with path " << path
+           << " and free space " << available_capacity;
+  devices_changed_observer_list_->Notify(
+      &DevicesChangedObserver::OnStorageFreeSpaceChanged,
+      path, available_capacity);
+}
+
 void SystemMonitor::NotifyRemovableStorageAttached(
     const std::string& id,
     const string16& name,
     const FilePath::StringType& location) {
   DVLOG(1) << "RemovableStorageAttached with name " << UTF16ToUTF8(name)
            << " and id " << id;
   devices_changed_observer_list_->Notify(
     &DevicesChangedObserver::OnRemovableStorageAttached, id, name, location);
 }
 
@@ skipping 18 matching lines @@
 void SystemMonitor::NotifyResume() {
   DVLOG(1) << "Power Resuming";
   power_observer_list_->Notify(&PowerObserver::OnResume);
 }
 
 void SystemMonitor::BatteryCheck() {
   ProcessPowerMessage(SystemMonitor::POWER_STATE_EVENT);
 }
 
 }  // namespace base