Support toggling Wi-Fi with keyboard shortcut.

ash/system/network/network_observer.h

Index: ash/system/network/network_observer.h
diff --git a/ash/system/network/network_observer.h b/ash/system/network/network_observer.h
index f55a71adc1ea5912a5b651a48a124f10474e0fc3..e30a0735a0c939fa4dfa7f88456122f24c41e3de 100644
--- a/ash/system/network/network_observer.h
+++ b/ash/system/network/network_observer.h
@@ -42,6 +42,9 @@ class NetworkObserver {
                                const string16& link_text) = 0;
   // Clears the error notification for |error_type|.
   virtual void ClearNetworkError(ErrorType error_type) = 0;
+
+  // Called when the user attempted to toggle Wi-Fi enable/disable.

[Daniel Erat, 2012/08/02 20:05:34]

nit: Mind adding another sentence saying something like "Toggling is
asynchronous and subsequent calls to query the current state may return the old
value"?

[mazda, 2012/08/02 21:01:48]

Done.

+  virtual void OnWillToggleWifi() = 0;
 };
 
 }  // namespace ash