HTML Imports: Fix race conditions on HTMLImportsChild

Source/core/html/imports/HTMLImportChild.cpp

Index: Source/core/html/imports/HTMLImportChild.cpp
diff --git a/Source/core/html/imports/HTMLImportChild.cpp b/Source/core/html/imports/HTMLImportChild.cpp
index 34972b2fad5ff637e59e20b88cf8d9c5f0ad9a87..7a02c587ea69dc086d1162e12dfcf5a687594ae4 100644
--- a/Source/core/html/imports/HTMLImportChild.cpp
+++ b/Source/core/html/imports/HTMLImportChild.cpp
@@ -139,13 +139,13 @@ Document* HTMLImportChild::document() const
 void HTMLImportChild::stateWillChange()
 {
     toHTMLImportsController(root())->scheduleRecalcState();
+    ensureLoader();
 }
 
 void HTMLImportChild::stateDidChange()
 {
     HTMLImport::stateDidChange();
 
-    ensureLoader();
     if (state().isReady())
         didFinish();
 }
@@ -184,7 +184,7 @@ void HTMLImportChild::shareLoader(HTMLImportChild* loader)
 
 bool HTMLImportChild::isDone() const
 {
-    return m_loader && m_loader->isDone() && !m_customElementMicrotaskStep;
+    return m_loader && m_loader->isDone() && !m_loader->microtaskQueue()->needsProcessOrStop() && !m_customElementMicrotaskStep;
 }
 
 bool HTMLImportChild::loaderHasError() const