JS: add import from descriptors to js.proto

js/js.serializer/src/js.proto

@@ -16,10 +16,29 @@
 
 package org.jetbrains.kotlin.serialization.js;
 
+import "core/deserialization/src/descriptors.proto";
+
 option java_outer_classname = "JsProtoBuf";
 option optimize_for = LITE_RUNTIME;
 
-// For Kotlin/Javascript we reuse builtins serialization code.
+extend Class {
+  repeated Annotation class_annotation = 130;
+}
+
+extend Callable {
+  repeated Annotation callable_annotation = 130;
+  optional Annotation.Argument.Value compile_time_value = 131;
+}
+
+extend Callable.ValueParameter {
+  repeated Annotation parameter_annotation = 130;
+}
+
+message Classes {
+  // id in StringTable
+  repeated int32 class_name = 1 [packed = true];
+}
+
 message Library {
   message FileEntry {
     required string path = 1;