Added functionality to chrome://net-internals/#chromeos page that user

chromeos/dbus/debug_daemon_client.h

Index: chromeos/dbus/debug_daemon_client.h
diff --git a/chromeos/dbus/debug_daemon_client.h b/chromeos/dbus/debug_daemon_client.h
index 38e401561398347e5f7b3d5c753fbadaf4fd5e6e..3d22b4505fc3ffad315eed12b181fbda645181ce 100644
--- a/chromeos/dbus/debug_daemon_client.h
+++ b/chromeos/dbus/debug_daemon_client.h
@@ -21,6 +21,16 @@ class CHROMEOS_EXPORT DebugDaemonClient {
  public:
   virtual ~DebugDaemonClient();
 
+  // Called once SetDebugMode() is complete. Takes one parameter:
+  // - succeeded: debug mode was changed successfully.
+  typedef base::Callback<void(bool succeeded)> SetDebugModeCallback;
+
+  // Requests to change debug mode to given |subsystem| and calls
+  // |callback| when completed. |subsystem| should be one of the
+  // following: "wifi", "ethernet", "cellular" or "none".

[satorux1, 2012/04/12 17:34:56]

thank you for adding!

+  virtual void SetDebugMode(const std::string& subsystem,
+                            const SetDebugModeCallback& callback) = 0;
+
   // Requests to start system/kernel tracing.
   virtual void StartSystemTracing() = 0;