Implement an infrastructure of Blink-in-JS

Source/bindings/v8/ScriptController.cpp

Index: Source/bindings/v8/ScriptController.cpp
diff --git a/Source/bindings/v8/ScriptController.cpp b/Source/bindings/v8/ScriptController.cpp
index cdd40e9cadb41b2b1c3101603cd81fc2af3a3368..681fa260cd4cb15ed2ce0e2d4f407ad96e20c939 100644
--- a/Source/bindings/v8/ScriptController.cpp
+++ b/Source/bindings/v8/ScriptController.cpp
@@ -476,6 +476,10 @@ void ScriptController::namedItemRemoved(HTMLDocument* doc, const AtomicString& n
 
 bool ScriptController::canExecuteScripts(ReasonForCallingCanExecuteScripts reason)
 {
+    v8::Isolate* isolate = v8::Isolate::GetCurrent();
+    if (isolate->InContext() && ScriptState::current(isolate)->world().isPrivateScriptIsolatedWorld())
+        return true;
+
     if (m_frame->document() && m_frame->document()->isSandboxed(SandboxScripts)) {
         // FIXME: This message should be moved off the console once a solution to https://bugs.webkit.org/show_bug.cgi?id=103274 exists.
         if (reason == AboutToExecuteScript)