Add methods for creating V8 extras-based ReadableStreams from C++

Source/core/testing/Internals.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 99 matching lines @@
 #include "core/loader/FrameLoader.h"
 #include "core/loader/HistoryItem.h"
 #include "core/page/ChromeClient.h"
 #include "core/page/FocusController.h"
 #include "core/page/NetworkStateNotifier.h"
 #include "core/page/Page.h"
 #include "core/page/PrintContext.h"
 #include "core/paint/DeprecatedPaintLayer.h"
 #include "core/plugins/testing/DictionaryPluginPlaceholder.h"
 #include "core/plugins/testing/DocumentFragmentPluginPlaceholder.h"
+#include "core/streams/ReadableStream2.h"
+#include "core/streams/ReadableStreamController.h"
+#include "core/streams/UnderlyingSourceBase.h"
 #include "core/svg/SVGImageElement.h"
 #include "core/testing/DictionaryTest.h"
 #include "core/testing/GCObservation.h"
 #include "core/testing/InternalRuntimeFlags.h"
 #include "core/testing/InternalSettings.h"
 #include "core/testing/LayerRect.h"
 #include "core/testing/LayerRectList.h"
 #include "core/testing/PluginPlaceholderOptions.h"
 #include "core/testing/PrivateScriptTest.h"
+#include "core/testing/ReadableStreamTestCase.h"
 #include "core/testing/TypeConversions.h"
 #include "core/testing/UnionTypesTest.h"
 #include "core/workers/WorkerThread.h"
 #include "platform/Cursor.h"
 #include "platform/Language.h"
 #include "platform/PlatformKeyboardEvent.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/TraceEvent.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/geometry/LayoutRect.h"
@@ skipping 2305 matching lines @@
         element->layoutObject()->addFocusRingRects(rects, LayoutPoint());
     return ClientRectList::create(rects);
 }
 
 void Internals::setCapsLockState(bool enabled)
 {
     PlatformKeyboardEvent::setCurrentCapsLockState(enabled ?
         PlatformKeyboardEvent::OverrideCapsLockState::On : PlatformKeyboardEvent::OverrideCapsLockState::Off);
 }
 
+ReadableStreamTestCase* Internals::createReadableStreamTestCase(ScriptState* scriptState)
+{
+    return new ReadableStreamTestCase(scriptState);
+}
+
 } // namespace blink