Enable the mojo-based serial API in the renderer behind a flag.

extensions/renderer/dispatcher.cc

Index: extensions/renderer/dispatcher.cc
diff --git a/extensions/renderer/dispatcher.cc b/extensions/renderer/dispatcher.cc
index 0cb5bb418dff81a78a50957b1de4b8f331266239..63eee886de759a98ed5aa820db56220a7a8dbcd2 100644
--- a/extensions/renderer/dispatcher.cc
+++ b/extensions/renderer/dispatcher.cc
@@ -571,6 +571,14 @@ std::vector<std::pair<std::string, int> > Dispatcher::GetJsResources() {
       std::make_pair(mojo::kUnicodeModuleName, IDR_MOJO_UNICODE_JS));
   resources.push_back(
       std::make_pair(mojo::kValidatorModuleName, IDR_MOJO_VALIDATOR_JS));
+  resources.push_back(std::make_pair("async_waiter", IDR_ASYNC_WAITER_JS));
+  resources.push_back(std::make_pair("data_receiver", IDR_DATA_RECEIVER_JS));
+  resources.push_back(std::make_pair("data_sender", IDR_DATA_SENDER_JS));
+  resources.push_back(std::make_pair("device/serial/data_stream.mojom",
+                                     IDR_DATA_STREAM_MOJOM_JS));
+  resources.push_back(
+      std::make_pair("device/serial/data_stream_serialization.mojom",
+                     IDR_DATA_STREAM_SERIALIZATION_MOJOM_JS));
 
   // Custom bindings.
   resources.push_back(
@@ -595,6 +603,17 @@ std::vector<std::pair<std::string, int> > Dispatcher::GetJsResources() {
                      IDR_WEB_VIEW_REQUEST_CUSTOM_BINDINGS_JS));
   resources.push_back(std::make_pair("binding", IDR_BINDING_JS));
 
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableMojoSerialService)) {
+    resources.push_back(
+        std::make_pair("serial", IDR_SERIAL_CUSTOM_BINDINGS_JS));
+  }
+  resources.push_back(std::make_pair("serial_service", IDR_SERIAL_SERVICE_JS));
+  resources.push_back(
+      std::make_pair("device/serial/serial.mojom", IDR_SERIAL_MOJOM_JS));
+  resources.push_back(std::make_pair("device/serial/serial_serialization.mojom",
+                                     IDR_SERIAL_SERIALIZATION_MOJOM_JS));
+
   // Custom types sources.
   resources.push_back(std::make_pair("StorageArea", IDR_STORAGE_AREA_JS));