Handle RESCAN events from the Bluetooth chooser by starting or extending a discovery session.

content/browser/bluetooth/bluetooth_dispatcher_host.h

Index: content/browser/bluetooth/bluetooth_dispatcher_host.h
diff --git a/content/browser/bluetooth/bluetooth_dispatcher_host.h b/content/browser/bluetooth/bluetooth_dispatcher_host.h
index 7e3e7af45cb7d59206db6e04237ee11c962828d7..427ded521d78bdc3987f5afbaef41bb49914d586 100644
--- a/content/browser/bluetooth/bluetooth_dispatcher_host.h
+++ b/content/browser/bluetooth/bluetooth_dispatcher_host.h
@@ -59,6 +59,10 @@ class CONTENT_EXPORT BluetoothDispatcherHost final
   // releasing references to previous |adapter_|.
   void set_adapter(scoped_refptr<device::BluetoothAdapter> adapter);
 
+  // Makes sure a BluetoothDiscoverySession is active for |session|, and resets
+  // its timeout.
+  void StartDiscovery(RequestDeviceSession* session, int chooser_id);

[ortuno, 2015/09/18 19:31:56]

Should this be named StartDeviceDiscovery? In case we have other types of
Discovery Sessions like service discovery or characteristic discovery?

[Jeffrey Yasskin, 2015/09/18 21:29:50]

Yeah, good point. Done.

+
   // Stops all BluetoothDiscoverySessions being run for requestDevice()
   // choosers.
   void StopDeviceDiscovery();