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.cc b/supplicant_interface_proxy.cc
index e0b1fbc..68359ff 100644
--- a/supplicant_interface_proxy.cc
+++ b/supplicant_interface_proxy.cc
@@ -64,6 +64,10 @@
   return proxy_.FastReauth(enabled);
 }
 
+void SupplicantInterfaceProxy::SetScanInterval(int32 scan_interval) {
+  return proxy_.ScanInterval(scan_interval);
+}
+
 // definitions for private class SupplicantInterfaceProxy::Proxy
 
 SupplicantInterfaceProxy::Proxy::Proxy(