Extend the capability of SystemMonitor to support watching storage free space change

chrome/browser/system_monitor/removable_device_notifications_linux.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.
 
 // RemovableDeviceNotificationsLinux implementation.
 
 #include "chrome/browser/system_monitor/removable_device_notifications_linux.h"
 
 #include <libudev.h>
 #include <mntent.h>
@@ skipping 223 matching lines @@
 RemovableDeviceNotificationsLinux::MountPointInfo::MountPointInfo() {
 }
 
 RemovableDeviceNotificationsLinux::RemovableDeviceNotificationsLinux(
     const FilePath& path)
     : initialized_(false),
       mtab_path_(path),
       get_device_info_func_(&GetDeviceInfo) {
   DCHECK(!g_removable_device_notifications_linux);
   g_removable_device_notifications_linux = this;
+
+  if (SystemMonitor::Get())
+    SystemMonitor::Get()->set_storage_free_space_delegate(this);
 }
 
 RemovableDeviceNotificationsLinux::RemovableDeviceNotificationsLinux(
     const FilePath& path,
     GetDeviceInfoFunc get_device_info_func)
     : initialized_(false),
       mtab_path_(path),
       get_device_info_func_(get_device_info_func) {
   DCHECK(!g_removable_device_notifications_linux);
   g_removable_device_notifications_linux = this;
+  if (SystemMonitor::Get())
+    SystemMonitor::Get()->set_storage_free_space_delegate(this);
 }
 
 RemovableDeviceNotificationsLinux::~RemovableDeviceNotificationsLinux() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   DCHECK_EQ(this, g_removable_device_notifications_linux);
   g_removable_device_notifications_linux = NULL;
+  if (SystemMonitor::Get())
+    SystemMonitor::Get()->set_storage_free_space_delegate(NULL);
 }
 
 // static
 RemovableDeviceNotificationsLinux*
 RemovableDeviceNotificationsLinux::GetInstance() {
   DCHECK(g_removable_device_notifications_linux != NULL);
   return g_removable_device_notifications_linux;
 }
 
 void RemovableDeviceNotificationsLinux::Init() {
@@ skipping 229 matching lines @@
 
   mount_info_map_[mount_point] = mount_point_info;
   mount_priority_map_[mount_device][mount_point] = removable;
 
   if (removable) {
     SystemMonitor::Get()->ProcessRemovableStorageAttached(device_id, name,
                                                           mount_point.value());
   }
 }
 
+bool RemovableDeviceNotificationsLinux::IsWatchingStorage(
+    const FilePath& path) {
+  NOTIMPLEMENTED();
+  return false;
+}
+
+void RemovableDeviceNotificationsLinux::StartWatchingStorage(
+    const FilePath& path) {
+  NOTIMPLEMENTED();
+}
+
+void RemovableDeviceNotificationsLinux::StopWatchingStorage(
+    const FilePath& path) {
+  NOTIMPLEMENTED();
+}
+
 }  // namespace chrome