shill: reduce delay between scans, when supplicant reports
"No suitable network".

BUG=chromium-os:27309
TEST=WiFiRomaing.001SSIDSwitchBack

Change-Id: Idd738f737abfdbdcf1e79aff21f860b5b52f1110
Reviewed-on: https://gerrit.chromium.org/gerrit/18021
Reviewed-by: mukesh agrawal <quiche@chromium.org>
Tested-by: mukesh agrawal <quiche@chromium.org>
Commit-Ready: mukesh agrawal <quiche@chromium.org>
diff --git a/supplicant_interface_proxy.h b/supplicant_interface_proxy.h
index 5d4d32f..87f46cd 100644
--- a/supplicant_interface_proxy.h
+++ b/supplicant_interface_proxy.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+// Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -38,6 +38,7 @@
       const std::map<std::string, ::DBus::Variant> &args);
   virtual void SelectNetwork(const ::DBus::Path &network);
   virtual void SetFastReauth(bool enabled);
+  virtual void SetScanInterval(int seconds);
 
  private:
   class Proxy : public fi::w1::wpa_supplicant1::Interface_proxy,