[ES6 modules] Implement https://html.spec.whatwg.org/#resolve-a-module-specifier

third_party/WebKit/Source/core/dom/Modulator.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 Modulator_h
 #define Modulator_h
 
 #include "core/CoreExport.h"
 #include "platform/heap/Handle.h"
+#include "platform/weborigin/KURL.h"
 
 namespace blink {
 
 class LocalFrame;
 
 // A Modulator is an interface for "environment settings object" concept for
 // module scripts.
 // https://html.spec.whatwg.org/#environment-settings-object
 //
 // A Modulator also serves as an entry point for various module spec algorithms.
 class CORE_EXPORT Modulator : public GarbageCollectedMixin {
  public:
   static Modulator* from(LocalFrame*);
+
+  // https://html.spec.whatwg.org/#resolve-a-module-specifier
+  static KURL resolveModuleSpecifier(const String& moduleRequest,
+                                     const KURL& baseURL);
 };
 
 }  // namespace blink
 
 #endif