[ES6 modules] Introduce ModulatorImpl

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

 // 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"
 #include "bindings/core/v8/V8Binding.h"
+#include "bindings/core/v8/V8PerContextData.h"
+#include "core/dom/Document.h"
+#include "core/dom/ModulatorImpl.h"
+#include "core/frame/LocalFrame.h"
 
 namespace blink {
 
 namespace {
 const char kPerContextDataKey[] = "Modulator";
 }  // namespace
 
 Modulator* Modulator::From(ScriptState* script_state) {
   if (!script_state)
     return nullptr;
+
   V8PerContextData* per_context_data = script_state->PerContextData();
   if (!per_context_data)
     return nullptr;
-  return static_cast<Modulator*>(per_context_data->GetData(kPerContextDataKey));
+
+  Modulator* modulator =
+      static_cast<Modulator*>(per_context_data->GetData(kPerContextDataKey));
+  if (!modulator) {
+    if (Document* document = ToDocument(ExecutionContext::From(script_state))) {
+      modulator = ModulatorImpl::Create(script_state, *document);
+      Modulator::SetModulator(script_state, modulator);
+    }
+  }
+  return modulator;
 }
 
 Modulator::~Modulator() {}
 
 void Modulator::SetModulator(ScriptState* script_state, Modulator* modulator) {
   DCHECK(script_state);
   V8PerContextData* per_context_data = script_state->PerContextData();
   DCHECK(per_context_data);
   per_context_data->AddData(kPerContextDataKey, modulator);
 }
@@ skipping 25 matching lines @@
   // script's base URL as the base URL.
   DCHECK(base_url.IsValid());
   KURL absolute_url(base_url, module_request);
   if (absolute_url.IsValid())
     return absolute_url;
 
   return KURL();
 }
 
 }  // namespace blink