Set serial connection parameters immediately on connect.

extensions/browser/api/serial/serial_connection.h

Index: extensions/browser/api/serial/serial_connection.h
diff --git a/extensions/browser/api/serial/serial_connection.h b/extensions/browser/api/serial/serial_connection.h
index cb698efa75f5eef3420591a8fda9ffa1ea2ba353..7fc553590007e825dabf9d9a6092784f55d7c837 100644
--- a/extensions/browser/api/serial/serial_connection.h
+++ b/extensions/browser/api/serial/serial_connection.h
@@ -73,7 +73,8 @@ class SerialConnection : public ApiResource,
   // Initiates an asynchronous Open of the device. It is the caller's
   // responsibility to ensure that this SerialConnection stays alive
   // until |callback| is run.
-  void Open(const OpenCompleteCallback& callback);
+  void Open(const core_api::serial::ConnectionOptions& options,
+            const OpenCompleteCallback& callback);
 
   // Begins an asynchronous receive operation. Calling this while a Receive
   // is already pending is a no-op and returns |false| without calling