Backed out 3 changesets (bug 1763586) foar causing sm bustages. CLOSED TREE

Backed out changeset 02a961432a49 (bug 1763586)
Backed out changeset 3fc84237decb (bug 1763586)
Backed out changeset 365eff56ce0f (bug 1763586)

dom/script/ScriptSettings.cpp

@@ -51,6 +51,34 @@
 namespace mozilla {
 namespace dom {
 
+JSObject* SourceElementCallback(JSContext* aCx, JS::HandleValue aPrivateValue) {
+  // NOTE: The result of this is only used by DevTools for matching sources, so
+  // it is safe to silently ignore any errors and return nullptr for them.
+
+  JS::loader::LoadedScript* script =
+      static_cast<JS::loader::LoadedScript*>(aPrivateValue.toPrivate());
+
+  JS::Rooted<JS::Value> elementValue(aCx);
+  {
+    nsCOMPtr<Element> domElement = script->GetScriptElement();
+    if (!domElement) {
+      return nullptr;
+    }
+
+    JSObject* globalObject =
+        domElement->OwnerDoc()->GetScopeObject()->GetGlobalJSObject();
+    JSAutoRealm ar(aCx, globalObject);
+
+    nsresult rv = nsContentUtils::WrapNative(aCx, domElement, &elementValue,
+                                             /* aAllowWrapping = */ true);
+    if (NS_FAILED(rv)) {
+      return nullptr;
+    }
+  }
+
+  return &elementValue.toObject();
+}
+
 static MOZ_THREAD_LOCAL(ScriptSettingsStackEntry*) sScriptSettingsTLS;
 
 class ScriptSettingsStack {
@@ -312,6 +340,7 @@ void AutoJSAPI::InitInternal(nsIGlobalObject* aGlobalObject, JSObject* aGlobal,
   mOldWarningReporter.emplace(JS::GetWarningReporter(aCx));
 
   JS::SetWarningReporter(aCx, WarningOnlyErrorReporter);
+  JS::SetSourceElementCallback(aCx, SourceElementCallback);
 
 #ifdef DEBUG
   if (haveException) {