[WIP Prototype] ES6 https://html.spec.whatwg.org/#fetch-a-single-module-script implementation

third_party/WebKit/Source/core/dom/Document.cpp

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index c69e212363ca0f5e1fe74a96c436c013208b4706..4237ea7772ed94881c260de74fd65dc0bb770b4f 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -35,6 +35,7 @@
 #include "bindings/core/v8/ExceptionStatePlaceholder.h"
 #include "bindings/core/v8/HTMLScriptElementOrSVGScriptElement.h"
 #include "bindings/core/v8/Microtask.h"
+#include "bindings/core/v8/ModuleController.h"
 #include "bindings/core/v8/ScriptController.h"
 #include "bindings/core/v8/SourceLocation.h"
 #include "bindings/core/v8/StringOrDictionary.h"
@@ -89,6 +90,7 @@
 #include "core/dom/IntersectionObserverController.h"
 #include "core/dom/LayoutTreeBuilderTraversal.h"
 #include "core/dom/LiveNodeList.h"
+#include "core/dom/ModulatorImpl.h"
 #include "core/dom/MutationObserver.h"
 #include "core/dom/NodeChildRemovalTracker.h"
 #include "core/dom/NodeComputedStyle.h"
@@ -6445,6 +6447,19 @@ PropertyRegistry* Document::propertyRegistry() {
   return m_propertyRegistry;
 }
 
+Modulator* Document::ensureModulator() {
+  if (!RuntimeEnabledFeatures::moduleScriptsEnabled())
+    return nullptr;
+
+  if (!m_modulator && frame()) {
+    m_modulator = ModulatorImpl::create(
+        this, ModuleController::create(ScriptState::forMainWorld(frame())),
+        fetcher());
+  }
+
+  return m_modulator;
+}
+
 const PropertyRegistry* Document::propertyRegistry() const {
   return const_cast<Document*>(this)->propertyRegistry();
 }
@@ -6529,6 +6544,7 @@ DEFINE_TRACE(Document) {
   visitor->trace(m_resizeObserverController);
   visitor->trace(m_propertyRegistry);
   visitor->trace(m_styleReattachDataMap);
+  visitor->trace(m_modulator);
   Supplementable<Document>::trace(visitor);
   TreeScope::trace(visitor);
   ContainerNode::trace(visitor);