[POC] Implement "module responses map" concept

third_party/WebKit/Source/core/loader/modulescript/ModuleScriptFetcher.h

Index: third_party/WebKit/Source/core/loader/modulescript/ModuleScriptFetcher.h
diff --git a/third_party/WebKit/Source/core/loader/modulescript/ModuleScriptFetcher.h b/third_party/WebKit/Source/core/loader/modulescript/ModuleScriptFetcher.h
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index 0000000000000000000000000000000000000000..2749bc4c7a7409fab083d28a4432cc29ed0bcc8a
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+++ b/third_party/WebKit/Source/core/loader/modulescript/ModuleScriptFetcher.h
@@ -0,0 +1,54 @@
+// 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.
+
+#ifndef ModuleScriptFetcher_h
+#define ModuleScriptFetcher_h
+
+#include "core/dom/Modulator.h"
+#include "core/loader/modulescript/ModuleScriptCreationParams.h"
+#include "core/loader/resource/ScriptResource.h"
+#include "platform/loader/fetch/FetchParameters.h"
+#include "platform/loader/fetch/ResourceFetcher.h"
+#include "platform/loader/fetch/ResourceOwner.h"
+#include "platform/weborigin/SecurityOrigin.h"
+#include "platform/wtf/Optional.h"
+
+namespace blink {
+
+class ModuleScriptLoader;
+
+class CORE_EXPORT ModuleScriptFetcher
+    : public GarbageCollectedFinalized<ModuleScriptFetcher>,
+      public ResourceOwner<ScriptResource> {
+  USING_GARBAGE_COLLECTED_MIXIN(ModuleScriptFetcher);
+
+ public:
+  ModuleScriptFetcher(FetchParameters, ResourceFetcher*, Modulator*);
+
+  void Fetch(ModuleScriptLoader*);
+
+  // Implements ScriptResourceClient
+  void NotifyFinished(Resource*) final;
+  String DebugName() const final { return "ModuleScriptFetcher"; }
+
+  DECLARE_TRACE();
+
+ protected:
+  // 'virtual' for custom fetch.
+  virtual void FetchInternal();
+  virtual void Finalize(WTF::Optional<ModuleScriptCreationParams>);
+
+  KURL GetRequestUrl() const { return fetch_params_.Url(); }
+
+ private:
+  FetchParameters fetch_params_;
+  Member<ResourceFetcher> fetcher_;
+  Member<Modulator> modulator_;
+  Member<ModuleScriptLoader> loader_;
+  bool was_fetched_ = false;
+};
+
+}  // namespace blink
+
+#endif  // ModuleScriptFetcher_h