Send WM_DEVICECHANGE message through SystemMonitor

base/system_monitor/system_monitor.h

Index: base/system_monitor/system_monitor.h
diff --git a/base/system_monitor/system_monitor.h b/base/system_monitor/system_monitor.h
index c7799945fa53be685f26a999061f5847647cf4f0..224620a14e8f81c5c2295a5743eb0401abe52736 100644
--- a/base/system_monitor/system_monitor.h
+++ b/base/system_monitor/system_monitor.h
@@ -90,15 +90,25 @@ class BASE_EXPORT SystemMonitor {
     virtual ~PowerObserver() {}
   };
 
+  class BASE_EXPORT DeviceChangeObserver {
+   public:
+    // Notification that the devices connected to the system have changed.
+     virtual void OnDeviceChange() {}

[sky, 2011/11/11 02:32:59]

OnDevicesChanged?

[scottmg, 2011/11/11 05:06:09]

Done.

+   protected:

[sky, 2011/11/11 02:32:59]

newline between 96 and 97

[scottmg, 2011/11/11 05:06:09]

Done.

+    virtual ~DeviceChangeObserver() {}
+  };
+
   // Add a new observer.
   // Can be called from any thread.
   // Must not be called from within a notification callback.
   void AddObserver(PowerObserver* obs);
+  void AddObserver(DeviceChangeObserver* obs);

[sky, 2011/11/11 02:32:59]

style guide recommends using different names for this sort of thing.

[scottmg, 2011/11/11 05:06:09]

Sorry, couldn't find something that looked relevant. Do you mean they both
shouldn't be AddObserver? i.e. AddPowerObserver and AddDeviceChangeObserver
instead?

 
   // Remove an existing observer.
   // Can be called from any thread.
   // Must not be called from within a notification callback.
   void RemoveObserver(PowerObserver* obs);
+  void RemoveObserver(DeviceChangeObserver* obs);
 
 #if defined(OS_WIN)
   // Windows-specific handling of a WM_POWERBROADCAST message.
@@ -110,6 +120,9 @@ class BASE_EXPORT SystemMonitor {
   // Cross-platform handling of a power event.
   void ProcessPowerMessage(PowerEvent event_id);
 
+  // Cross-platform handling of a device change event.
+  void ProcessDeviceChange();

[sky, 2011/11/11 02:32:59]

ProcessDevicesChanged?

[scottmg, 2011/11/11 05:06:09]

Done.

+
  private:
 #if defined(OS_MACOSX)
   void PlatformInit();
@@ -126,11 +139,14 @@ class BASE_EXPORT SystemMonitor {
   void BatteryCheck();
 
   // Functions to trigger notifications.
+  void NotifyDeviceChange();

[sky, 2011/11/11 02:32:59]

NotifyDevicesChanged

[scottmg, 2011/11/11 05:06:09]

Done.

   void NotifyPowerStateChange();
   void NotifySuspend();
   void NotifyResume();
 
-  scoped_refptr<ObserverListThreadSafe<PowerObserver> > observer_list_;
+  scoped_refptr<ObserverListThreadSafe<PowerObserver> > power_observer_list_;
+  scoped_refptr<ObserverListThreadSafe<DeviceChangeObserver> >
+      device_change_observer_list_;
   bool battery_in_use_;
   bool suspended_;