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

third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp

Index: third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp b/third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp
index 69aae26cc7439d356c027922de5f987807095437..0b23c3981de4b396fe0ca22649de41aed4cdb020 100644
--- a/third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp
@@ -46,6 +46,7 @@
 #include "bindings/core/v8/V8PagePopupControllerBinding.h"
 #include "bindings/core/v8/V8PrivateProperty.h"
 #include "bindings/core/v8/V8Window.h"
+#include "core/dom/ModulatorImpl.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/csp/ContentSecurityPolicy.h"
 #include "core/html/DocumentNameCollection.h"
@@ -409,6 +410,19 @@ void WindowProxy::updateActivityLogger() {
               : KURL()));
 }
 
+void WindowProxy::updateModulator() {
+  DCHECK(m_world->isMainWorld());
+
+  if (!RuntimeEnabledFeatures::moduleScriptsEnabled())
+    return;
+  if (!m_frame->isLocalFrame())
+    return;
+  if (Document* document = toLocalFrame(m_frame)->document()) {
+    Modulator* modulator = ModulatorImpl::create(m_scriptState, *document);

[haraken, 2017/01/11 02:31:28]

How heavy would it be to create Modulator for all documents (most documents
won't need Modulator)?

Can we create the Modulator lazily when V8PerContextData::modulator() is
accessed? Then we don't need to eagerly create/update the Modulator here.

[kouhei (in TOK), 2017/01/17 05:26:13]

Done.

+    m_scriptState->perContextData()->setModulator(modulator);
+  }
+}
+
 void WindowProxy::setSecurityToken(SecurityOrigin* origin) {
   // If two tokens are equal, then the SecurityOrigins canAccess each other.
   // If two tokens are not equal, then we have to call canAccess.
@@ -464,6 +478,7 @@ void WindowProxy::updateDocument() {
     return;
 
   updateActivityLogger();
+  updateModulator();
   updateDocumentProperty();
   updateSecurityOrigin(m_frame->securityContext()->getSecurityOrigin());
 }