[Easy Unlock] Port the BluetoothConnection class to native code.

components/proximity_auth/wire_message.h

Index: components/proximity_auth/wire_message.h
diff --git a/components/proximity_auth/wire_message.h b/components/proximity_auth/wire_message.h
index 36107620f22bb585250c5196b0433d700b41f8ee..4cf44cb2b9f24536e9c6252d59f55cad7746e5ea 100644
--- a/components/proximity_auth/wire_message.h
+++ b/components/proximity_auth/wire_message.h
@@ -24,6 +24,9 @@ class WireMessage {
       const std::string& serialized_message,
       bool* is_incomplete_message);
 
+  // Returns a serialized representation of |this| message.
+  virtual std::string Serialize() const;
+
   const std::string& permit_id() const { return permit_id_; }
   const std::string& payload() const { return payload_; }