bind-gen: Update the generated file list and fix IDL definition

Adds missing default values to BidirectionalStream, and registers
the generated files.

Bug: 839389
Change-Id: I714556867f05ff8907c9cba0722aebd22e28e785
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2200779Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Reviewed-by: Adam Rice <ricea@chromium.org>
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#768771}

third_party/blink/renderer/bindings/generated_in_modules.gni

@@ -404,6 +404,8 @@ generated_interface_sources_in_modules = [
   "$root_gen_dir/third_party/blink/renderer/bindings/modules/v8/v8_battery_manager.h",
   "$root_gen_dir/third_party/blink/renderer/bindings/modules/v8/v8_before_install_prompt_event.cc",
   "$root_gen_dir/third_party/blink/renderer/bindings/modules/v8/v8_before_install_prompt_event.h",
+  "$root_gen_dir/third_party/blink/renderer/bindings/modules/v8/v8_bidirectional_stream.cc",
+  "$root_gen_dir/third_party/blink/renderer/bindings/modules/v8/v8_bidirectional_stream.h",
   "$root_gen_dir/third_party/blink/renderer/bindings/modules/v8/v8_biquad_filter_node.cc",
   "$root_gen_dir/third_party/blink/renderer/bindings/modules/v8/v8_biquad_filter_node.h",
   "$root_gen_dir/third_party/blink/renderer/bindings/modules/v8/v8_blob_event.cc",

third_party/blink/renderer/modules/webtransport/bidirectional_stream.idl

@@ -12,10 +12,10 @@ interface BidirectionalStream {
   // inheritance.
   readonly attribute WritableStream writable;
   readonly attribute Promise<StreamAbortInfo> writingAborted;
-  void abortWriting(optional StreamAbortInfo abortInfo);
+  void abortWriting(optional StreamAbortInfo abortInfo = {});
 
   // Attributes from the IncomingStream mixin.
   readonly attribute ReadableStream readable;
   readonly attribute Promise<StreamAbortInfo> readingAborted;
-  void abortReading(optional StreamAbortInfo abortInfo);
+  void abortReading(optional StreamAbortInfo abortInfo = {});
 };