Add serialization support to the JS DataSender and DataReceiver.

extensions/renderer/api/serial/serial_api_unittest.cc

Index: extensions/renderer/api/serial/serial_api_unittest.cc
diff --git a/extensions/renderer/api/serial/serial_api_unittest.cc b/extensions/renderer/api/serial/serial_api_unittest.cc
index e511d30b76578985f34aca902cf9ecf60cfa4a89..b4f81536ca6c2e4a6cd34ca53cda32ba86c5244b 100644
--- a/extensions/renderer/api/serial/serial_api_unittest.cc
+++ b/extensions/renderer/api/serial/serial_api_unittest.cc
@@ -404,6 +404,8 @@ class SerialApiTest : public ApiTestBase {
     env()->RegisterModule("serial_service", IDR_SERIAL_SERVICE_JS);
     env()->RegisterModule("device/serial/data_stream.mojom",
                           IDR_DATA_STREAM_MOJOM_JS);
+    env()->RegisterModule("device/serial/data_stream_serialization.mojom",
+                          IDR_DATA_STREAM_SERIALIZATION_MOJOM_JS);
     env()->RegisterModule("device/serial/serial.mojom", IDR_SERIAL_MOJOM_JS);
     service_provider()->AddService<device::serial::SerialService>(base::Bind(
         &SerialApiTest::CreateSerialService, base::Unretained(this)));