Bug 1761938 - Part 4: Give module loaders a global object field r=smaug,yulia

This gives the module loader a field for the current global, since a module map
is only associated with a single global.

This adds a method to Document to tell the script loader when its global
changes. I'm not sure of when we do this exactly.

Differential Revision: https://phabricator.services.mozilla.com/D142831

dom/script/ModuleLoader.cpp

@@ -48,8 +48,9 @@ namespace mozilla::dom {
 // DOM module loader
 //////////////////////////////////////////////////////////////
 
-ModuleLoader::ModuleLoader(ScriptLoader* aLoader, Kind aKind)
-    : ModuleLoaderBase(aLoader), mKind(aKind) {}
+ModuleLoader::ModuleLoader(ScriptLoader* aLoader,
+                           nsIGlobalObject* aGlobalObject, Kind aKind)
+    : ModuleLoaderBase(aLoader, aGlobalObject), mKind(aKind) {}
 
 ScriptLoader* ModuleLoader::GetScriptLoader() {
   return static_cast<ScriptLoader*>(mLoader.get());