[modules] Add partial support for debug-scopes.

src/debug/debug-scopes.h

Index: src/debug/debug-scopes.h
diff --git a/src/debug/debug-scopes.h b/src/debug/debug-scopes.h
index 026a1da0f55329cdc55c1cb0ba199e61614e6b73..87c85b8ba5aba60df00a4034fd42fd65077ff2fa 100644
--- a/src/debug/debug-scopes.h
+++ b/src/debug/debug-scopes.h
@@ -153,6 +153,9 @@ class ScopeIterator {
   void CopyContextLocalsToScopeObject(Handle<ScopeInfo> scope_info,
                                       Handle<Context> context,
                                       Handle<JSObject> scope_object);
+  void CopyModuleVarsToScopeObject(Handle<ScopeInfo> scope_info,
+                                   Handle<Context> context,
+                                   Handle<JSObject> scope_object);
   void CopyContextExtensionToScopeObject(Handle<Context> context,
                                          Handle<JSObject> scope_object,
                                          KeyCollectionMode mode);