[ES6 modules] Introduce ModuleScriptLoader

third_party/WebKit/Source/core/testing/DummyModulator.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 DummyModulator_h
+#define DummyModulator_h
+
+#include "bindings/core/v8/ScriptModule.h"
+#include "core/CoreExport.h"
+#include "core/dom/Modulator.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+// DummyModulator provides empty Modulator interface implementation w/
+// NOTREACHED().
+//
+// DummyModulator is useful for unit-testing.
+// Not all module implementation components require full-blown Modulator
+// implementation. Unit tests can implement a subset of Modulator interface
+// which is exercised from unit-under-test.
+class CORE_EXPORT DummyModulator
+    : public GarbageCollectedFinalized<DummyModulator>,
+      public Modulator {
+  USING_GARBAGE_COLLECTED_MIXIN(DummyModulator);
+
+ public:
+  DummyModulator() = default;
+  virtual ~DummyModulator() {}
+  DEFINE_INLINE_TRACE() {}
+
+  ReferrerPolicy referrerPolicy() override {
+    NOTREACHED();
+    return ReferrerPolicyDefault;
+  }
+
+  ScriptModule compileModule(const String& script,
+                             const String& urlStr) override {
+    NOTREACHED();
+    return ScriptModule();
+  }
+};
+
+}  // namespace blink
+
+#endif