add device type as an argument in OnDevicesChanged.

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 65 matching lines @@
       break;
     case SUSPEND_EVENT:
       if (!suspended_) {
         suspended_ = true;
         NotifySuspend();
       }
       break;
   }
 }
 
-void SystemMonitor::ProcessDevicesChanged() {
-  NotifyDevicesChanged();
+void SystemMonitor::ProcessDevicesChanged(DeviceType device_type) {
+  NotifyDevicesChanged(device_type);
 }
 
 void SystemMonitor::ProcessMediaDeviceAttached(
     const std::string& id,
     const string16& name,
     MediaDeviceType type,
     const FilePath::StringType& location) {
   MediaDeviceInfo info(id, name, type, location);
   if (ContainsKey(media_device_map_, id)) {
     // This can happen if our unique id scheme fails. Ignore the incoming
@@ skipping 31 matching lines @@
 }
 
 void SystemMonitor::AddDevicesChangedObserver(DevicesChangedObserver* obs) {
   devices_changed_observer_list_->AddObserver(obs);
 }
 
 void SystemMonitor::RemoveDevicesChangedObserver(DevicesChangedObserver* obs) {
   devices_changed_observer_list_->RemoveObserver(obs);
 }
 
-void SystemMonitor::NotifyDevicesChanged() {
-  DVLOG(1) << "DevicesChanged";
+void SystemMonitor::NotifyDevicesChanged(DeviceType device_type) {
+  DVLOG(1) << "DevicesChanged with device type " << device_type;
   devices_changed_observer_list_->Notify(
-    &DevicesChangedObserver::OnDevicesChanged);
+      &DevicesChangedObserver::OnDevicesChanged, device_type);
 }
 
 void SystemMonitor::NotifyMediaDeviceAttached(
     const std::string& id,
     const string16& name,
     MediaDeviceType type,
     const FilePath::StringType& location) {
   DVLOG(1) << "MediaDeviceAttached with name " << UTF16ToUTF8(name)
            << " and id " << id;
   devices_changed_observer_list_->Notify(
@@ skipping 21 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