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

BUG=413488
TEST=components_unittests
[email protected]

Review URL: https://codereview.chromium.org/585743004

Cr-Commit-Position: refs/heads/master@{#296872}
diff --git a/components/proximity_auth/wire_message.cc b/components/proximity_auth/wire_message.cc
index 678014d..646d0b0 100644
--- a/components/proximity_auth/wire_message.cc
+++ b/components/proximity_auth/wire_message.cc
@@ -111,6 +111,11 @@
   return scoped_ptr<WireMessage>(new WireMessage(permit_id, payload));
 }
 
+std::string WireMessage::Serialize() const {
+  // TODO(isherman): Implement.
+  return "This method is not yet implemented.";
+}
+
 WireMessage::WireMessage(const std::string& permit_id,
                          const std::string& payload)
     : permit_id_(permit_id),