Bluetooth: gather usage metrics

chrome/browser/metrics/metrics_log.h

Index: chrome/browser/metrics/metrics_log.h
diff --git a/chrome/browser/metrics/metrics_log.h b/chrome/browser/metrics/metrics_log.h
index f5cf34e9235085c1440661515c4a7956dd14f613..3e6589ae990c44184f7b2ffc89f1ab32ce1a702e 100644
--- a/chrome/browser/metrics/metrics_log.h
+++ b/chrome/browser/metrics/metrics_log.h
@@ -30,6 +30,10 @@ namespace base {
 class DictionaryValue;
 }
 
+namespace device {
+class BluetoothAdapter;
+}
+
 namespace tracked_objects {
 struct ProcessDataSnapshot;
 }
@@ -189,6 +193,10 @@ class MetricsLog : public MetricsLogBase {
   // This is a no-op if called on a non-Windows platform.
   void WriteGoogleUpdateProto(const GoogleUpdateMetrics& google_update_metrics);
 
+  // Writes info about paired Bluetooth devices on this system.
+  // This is a no-op if called on a non-Chrome OS platform.
+  void WriteBluetoothProto(scoped_refptr<device::BluetoothAdapter> adapter);
+
   // Observes network state to provide values for SystemProfile::Network.
   MetricsNetworkObserver network_observer_;