Get WrapperTypeInfo via ScriptWrappable

as opposed to using a dedicated internal field for that.

Bug: 328117814
Change-Id: I01f9aff3ad8a41fafbd2655d23f076a0f76fdc57
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5455405
Reviewed-by: Nate Chapin <japhet@chromium.org>
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1288405}

third_party/blink/renderer/bindings/modules/v8/v8_context_snapshot_impl.cc

@@ -271,6 +271,22 @@ void DeserializeInternalFieldCallback(v8::Local<v8::Object> object,
   }
 }
 
+namespace {
+// We only care for WrapperTypeInfo and do not supply an actual instance of
+// the document. Since we need a script wrappable to get type info now, this
+// class is a minimal implementation of ScriptWrappable that returns correct
+// type info for HTMLDocument.
+class DummyHTMLDocumentForSnapshot : public ScriptWrappable {
+ public:
+  DummyHTMLDocumentForSnapshot() = default;
+
+ private:
+  const WrapperTypeInfo* GetWrapperTypeInfo() const override {
+    return V8HTMLDocument::GetWrapperTypeInfo();
+  }
+};
+}  // namespace
+
 void TakeSnapshotForWorld(v8::SnapshotCreator* snapshot_creator,
                           const DOMWrapperWorld& world) {
   v8::Isolate* isolate = snapshot_creator->GetIsolate();
@@ -300,11 +316,9 @@ void TakeSnapshotForWorld(v8::SnapshotCreator* snapshot_creator,
     v8::Local<v8::Object> document_wrapper = CreatePlatformObject(
         isolate, context, world, document_wrapper_type_info);
 
-    int indices[] = {kV8DOMWrapperObjectIndex, kV8DOMWrapperTypeIndex};
-    void* values[] = {nullptr,
-                      const_cast<WrapperTypeInfo*>(document_wrapper_type_info)};
-    document_wrapper->SetAlignedPointerInInternalFields(std::size(indices),
-                                                        indices, values);
+    V8DOMWrapper::SetNativeInfo(
+        isolate, document_wrapper, document_wrapper_type_info,
+        MakeGarbageCollected<DummyHTMLDocumentForSnapshot>());
 
     V8PrivateProperty::GetWindowDocumentCachedAccessor(isolate).Set(
         context->Global(), document_wrapper);

third_party/blink/renderer/platform/bindings/wrapper_type_info.cc

@@ -57,13 +57,14 @@ v8::Local<v8::Template> WrapperTypeInfo::GetV8ClassTemplate(
   return v8_template;
 }
 
-const WrapperTypeInfo* ToWrapperTypeInfo(
-    const v8::TracedReference<v8::Object>& wrapper) {
-  return GetInternalField<WrapperTypeInfo, kV8DOMWrapperTypeIndex>(wrapper);
-}
-
 const WrapperTypeInfo* ToWrapperTypeInfo(v8::Local<v8::Object> wrapper) {
-  return GetInternalField<WrapperTypeInfo, kV8DOMWrapperTypeIndex>(wrapper);
+  const auto* wrappable = ToScriptWrappable(wrapper->GetIsolate(), wrapper);
+  const WrapperTypeInfo* type_info =
+      wrappable ? wrappable->GetWrapperTypeInfo() : nullptr;
+  DCHECK_EQ(
+      type_info,
+      (GetInternalField<WrapperTypeInfo, kV8DOMWrapperTypeIndex>(wrapper)));
+  return type_info;
 }
 
 }  // namespace blink

third_party/blink/renderer/platform/bindings/wrapper_type_info.h

@@ -206,9 +206,6 @@ inline ScriptWrappable* ToScriptWrappable(v8::Isolate* isolate,
                                                                      wrapper);
 }
 
-PLATFORM_EXPORT const WrapperTypeInfo* ToWrapperTypeInfo(
-    const v8::TracedReference<v8::Object>& wrapper);
-
 PLATFORM_EXPORT const WrapperTypeInfo* ToWrapperTypeInfo(
     v8::Local<v8::Object> wrapper);