[ES6 modules] Introduce ModuleScriptLoader

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"
+#include "platform/weborigin/ReferrerPolicy.h"
+#include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class LocalFrame;
+class SecurityOrigin;
+class ScriptModule;
+
+// spec: "top-level module fetch flag"
+// https://html.spec.whatwg.org/multipage/webappapis.html#fetching-scripts-is-top-level
+enum class ModuleGraphLevel { TopLevelModuleFetch, DependentModuleFetch };
 
 // 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*);
 
+  virtual ReferrerPolicy referrerPolicy() = 0;
+  virtual SecurityOrigin* securityOrigin() = 0;
+
   // https://html.spec.whatwg.org/#resolve-a-module-specifier
   static KURL resolveModuleSpecifier(const String& moduleRequest,
                                      const KURL& baseURL);
+
+  // TODO(kouhei): script should be a ScriptSourceCode.
+  virtual ScriptModule compileModule(const String& script,
+                                     const String& urlStr) = 0;
 };
 
 }  // namespace blink
 
 #endif