[WIP Prototype] ES6 https://html.spec.whatwg.org/#fetch-a-single-module-script implementation

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

+// 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 ScriptModuleResolver_h
+#define ScriptModuleResolver_h
+
+#include "wtf/text/WTFString.h"
+
+namespace blink {
+
+class ScriptModule;
+class ScriptModuleIdentifier;
+class ModuleScript;
+
+// The ScriptModuleResolver interface is used from V8 module bindings
+// to resolve script module descendents references stored in core/dom module
+// implementation.
+class ScriptModuleResolver {
+ public:
+  // Called from ModuleMap to observe all fetched ModuleScript instances which
+  // might be specified as a referrer.
+  virtual void registerModuleScript(ModuleScript*) = 0;
+
+  // Implements "Runtime Semantics: HostResolveImportedModule"
+  // https://tc39.github.io/ecma262/#sec-hostresolveimportedmodule
+  virtual ScriptModule resolve(const String& specifier,
+                               ScriptModuleIdentifier referrer) = 0;
+};
+
+}  // namespace blink
+
+#endif  // ScriptModuleResolver_h