[api] Prototype WeakRef implementation

src/inspector/v8-injected-script-host.cc

Index: src/inspector/v8-injected-script-host.cc
diff --git a/src/inspector/v8-injected-script-host.cc b/src/inspector/v8-injected-script-host.cc
index 663e9e7b020f6d4d096763285d9bfb1094089f4d..18dee376e5442d68d3d2319c75b4ab2f2c9cdf4f 100644
--- a/src/inspector/v8-injected-script-host.cc
+++ b/src/inspector/v8-injected-script-host.cc
@@ -199,6 +199,10 @@ void V8InjectedScriptHost::subtypeCallback(
     info.GetReturnValue().Set(toV8StringInternalized(isolate, "weakset"));
     return;
   }
+  if (value->IsWeakRef()) {
+    info.GetReturnValue().Set(toV8StringInternalized(isolate, "weakref"));
+    return;
+  }
   if (value->IsMapIterator() || value->IsSetIterator()) {
     info.GetReturnValue().Set(toV8StringInternalized(isolate, "iterator"));
     return;