Map signal_strength from percentage to dBm per spec

chrome/browser/chromeos/policy/device_status_collector.h

Index: chrome/browser/chromeos/policy/device_status_collector.h
diff --git a/chrome/browser/chromeos/policy/device_status_collector.h b/chrome/browser/chromeos/policy/device_status_collector.h
index f91298d433a16533521d3126fc50d8924c6a873c..61625faf2b0bb18742b0e38c3152634e275970a8 100644
--- a/chrome/browser/chromeos/policy/device_status_collector.h
+++ b/chrome/browser/chromeos/policy/device_status_collector.h
@@ -185,6 +185,10 @@ class DeviceStatusCollector {
   // Callback invoked to update our cpu usage information.
   void ReceiveCPUStatistics(const std::string& statistics);
 
+  // Helper routine to convert from Shill-provided signal strength (percent)
+  // to dBm units expected by server.
+  int ConvertSignalStrength(int signal_strength);
+
   PrefService* local_state_;
 
   // The last time an idle state check was performed.