[ES6 modules] Introduce Modulator "module map settings object"

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

Index: third_party/WebKit/Source/core/dom/Modulator.cpp
diff --git a/third_party/WebKit/Source/core/dom/Modulator.cpp b/third_party/WebKit/Source/core/dom/Modulator.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..90529aa0e5bd68dc78c6d4fd8161b19d6f54a2a7
--- /dev/null
+++ b/third_party/WebKit/Source/core/dom/Modulator.cpp
@@ -0,0 +1,15 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "core/dom/Modulator.h"
+
+#include "bindings/core/v8/ScriptState.h"
+
+namespace blink {
+
+Modulator* Modulator::from(LocalFrame* frame) {
+  return ScriptState::forMainWorld(frame)->perContextData()->modulator();

[dominicc (has gone to gerrit), 2017/01/18 06:59:01]

WDYT about returning nullptr when ScriptState::forMainWorld is null? Up to you.
Depends on how you imagine this being used.

[kouhei (in TOK), 2017/01/18 07:07:10]

Done.

+}
+
+}  // namespace blink