Dispatching errors across iframes don't match webplatform tests

third_party/WebKit/Source/bindings/core/v8/ScriptState.h

Index: third_party/WebKit/Source/bindings/core/v8/ScriptState.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/ScriptState.h b/third_party/WebKit/Source/bindings/core/v8/ScriptState.h
index b0b0fd8530be5f9b3711f8272a63d42d98737c63..c634fbd35eef854a9885f6e9ecad205868f0e654 100644
--- a/third_party/WebKit/Source/bindings/core/v8/ScriptState.h
+++ b/third_party/WebKit/Source/bindings/core/v8/ScriptState.h
@@ -183,6 +183,34 @@ class ScriptStateProtectingContext {
   ScopedPersistent<v8::Context> m_context;
 };
 
+class ScriptStateForErrorEvent : public RefCounted<ScriptStateForErrorEvent> {
+ public:
+  class Scope {
+    STACK_ALLOCATED();
+
+   public:
+    explicit Scope(ScriptState*, v8::Local<v8::Context>);
+    ~Scope();
+
+   private:
+    RefPtr<ScriptState> m_scriptState;
+  };
+
+  static PassRefPtr<ScriptStateForErrorEvent> create(v8::Local<v8::Context>);
+  ScriptState* scriptState() {
+    return ScriptState::from(m_context.newLocal(m_isolate));
+  }
+  v8::Local<v8::Context> context() const {
+    return m_context.newLocal(m_isolate);
+  }
+
+ private:
+  ScriptStateForErrorEvent(v8::Local<v8::Context> context)
+      : m_isolate(context->GetIsolate()), m_context(m_isolate, context) {}
+  v8::Isolate* m_isolate;
+  ScopedPersistent<v8::Context> m_context;
+};
+
 }  // namespace blink
 
 #endif  // ScriptState_h