Add Media device notification to SystemMonitor and Mac impl

base/system_monitor/system_monitor.cc

 // Copyright (c) 2011 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 "base/logging.h"
 #include "base/message_loop.h"
 #include "base/time.h"
 
@@ skipping 65 matching lines @@
         NotifySuspend();
       }
       break;
   }
 }
 
 void SystemMonitor::ProcessDevicesChanged() {
   NotifyDevicesChanged();
 }
 
+void SystemMonitor::ProcessMediaDeviceAttached(const std::string& name,
+                                               const FilePath& path) {
+  NotifyDevicesChanged();

[tpayne, 2012/02/08 16:20:30]

At least on windows, this will end up getting called twice because windows
generates 2 separate events for attach/detach.

[vandebo (ex-Chrome), 2012/02/08 18:37:01]

Yea, I realized that on my drive home.  Maybe we should make DeviceChanged more
specific - is it only USB devices that trigger it now?

+  NotifyMediaDeviceAttached(name, path);
+}
+
+void SystemMonitor::ProcessMediaDeviceDetached(const std::string& name) {
+  NotifyDevicesChanged();
+  NotifyMediaDeviceDetached(name);
+}
+
 void SystemMonitor::AddPowerObserver(PowerObserver* obs) {
   power_observer_list_->AddObserver(obs);
 }
 
 void SystemMonitor::RemovePowerObserver(PowerObserver* obs) {
   power_observer_list_->RemoveObserver(obs);
 }
 
 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";
   devices_changed_observer_list_->Notify(
     &DevicesChangedObserver::OnDevicesChanged);
 }
 
+void SystemMonitor::NotifyMediaDeviceAttached(const std::string& name,
+                                              const FilePath& path) {
+  devices_changed_observer_list_->Notify(
+    &DevicesChangedObserver::OnMediaDeviceAttached, name, path);
+}
+
+void SystemMonitor::NotifyMediaDeviceDetached(const std::string& name) {
+  devices_changed_observer_list_->Notify(
+    &DevicesChangedObserver::OnMediaDeviceDetached, name);
+}
+
 void SystemMonitor::NotifyPowerStateChange() {
   DVLOG(1) << "PowerStateChange: " << (BatteryPower() ? "On" : "Off")
            << " battery";
   power_observer_list_->Notify(&PowerObserver::OnPowerStateChange,
                                BatteryPower());
 }
 
 void SystemMonitor::NotifySuspend() {
   DVLOG(1) << "Power Suspending";
   power_observer_list_->Notify(&PowerObserver::OnSuspend);
 }
 
 void SystemMonitor::NotifyResume() {
   DVLOG(1) << "Power Resuming";
   power_observer_list_->Notify(&PowerObserver::OnResume);
 }
 
 void SystemMonitor::BatteryCheck() {
   ProcessPowerMessage(SystemMonitor::POWER_STATE_EVENT);
 }
 
 }  // namespace base