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

Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/KeyframeEffect.idl',
             'animation/EffectModel.idl',
             'animation/AnimationEffectReadOnly.idl',
@@ skipping 277 matching lines @@
             'inspector/InspectorOverlayHost.idl',
             'loader/appcache/ApplicationCache.idl',
             'page/EventSource.idl',
             'page/PagePopupController.idl',
             'page/scrolling/ScrollState.idl',
             'streams/ReadableByteStream.idl',
             'streams/ReadableByteStreamReader.idl',
             'streams/ReadableStream.idl',
             'streams/ReadableStreamReader.idl',
             'streams/Stream.idl',
+            'streams/UnderlyingSourceBase.idl',
             'svg/SVGAElement.idl',
             'svg/SVGAngle.idl',
             'svg/SVGAnimateElement.idl',
             'svg/SVGAnimateMotionElement.idl',
             'svg/SVGAnimateTransformElement.idl',
             'svg/SVGAnimatedAngle.idl',
             'svg/SVGAnimatedBoolean.idl',
             'svg/SVGAnimatedEnumeration.idl',
             'svg/SVGAnimatedInteger.idl',
             'svg/SVGAnimatedLength.idl',
@@ skipping 1694 matching lines @@
             'paint/ViewPainter.h',
             'plugins/PluginPlaceholder.h',
             'plugins/PluginView.h',
             'plugins/testing/DictionaryPluginPlaceholder.h',
             'plugins/testing/DocumentFragmentPluginPlaceholder.h',
             'streams/ReadableByteStream.cpp',
             'streams/ReadableByteStream.h',
             'streams/ReadableByteStreamReader.h',
             'streams/ReadableStream.cpp',
             'streams/ReadableStream.h',
+            'streams/ReadableStream2.cpp',
+            'streams/ReadableStream2.h',
+            'streams/ReadableStreamController.h',
             'streams/ReadableStreamImpl.h',
             'streams/ReadableStreamReader.cpp',
             'streams/ReadableStreamReader.h',
             'streams/Stream.cpp',
             'streams/Stream.h',
             'streams/UnderlyingSource.h',
+            'streams/UnderlyingSourceBase.cpp',
+            'streams/UnderlyingSourceBase.h',
             'timing/ConsoleMemory.cpp',
             'timing/ConsoleMemory.h',
             'timing/DOMWindowPerformance.cpp',
             'timing/DOMWindowPerformance.h',
             'timing/MemoryInfo.cpp',
             'timing/Performance.cpp',
             'timing/Performance.h',
             'timing/PerformanceBase.cpp',
             'timing/PerformanceBase.h',
             'timing/PerformanceCompositeTiming.cpp',
@@ skipping 1715 matching lines @@
             'testing/PluginPlaceholderOptions.idl',
         ],
         'webcore_testing_idl_files': [
             'testing/DictionaryTest.idl',
             'testing/GCObservation.idl',
             'testing/GarbageCollectedScriptWrappable.idl',
             'testing/InternalSettings.idl',
             'testing/LayerRect.idl',
             'testing/LayerRectList.idl',
             'testing/PrivateScriptTest.idl',
+            'testing/ReadableStreamTestCase.idl',
+            'testing/ReadableStreamTestRequest.idl',
+            'testing/ReadableStreamTestSource.idl',
             'testing/RefCountedScriptWrappable.idl',
             'testing/TypeConversions.idl',
             'testing/UnionTypesTest.idl',
         ],
         # testing IDL files that have partial interfaces in modules.
         'webcore_testing_idl_with_modules_dependency_files': [
             'testing/Internals.idl',
         ],
         'webcore_testing_dependency_idl_files': [
             'testing/PartialPrivateScriptTest.idl',
@@ skipping 27 matching lines @@
             'testing/InternalSettings.h',
             'testing/Internals.cpp',
             'testing/Internals.h',
             'testing/LayerRect.h',
             'testing/LayerRectList.cpp',
             'testing/LayerRectList.h',
             'testing/NullExecutionContext.cpp',
             'testing/NullExecutionContext.h',
             'testing/PrivateScriptTest.cpp',
             'testing/PrivateScriptTest.h',
+            'testing/ReadableStreamTestCase.cpp',
+            'testing/ReadableStreamTestCase.h',
+            'testing/ReadableStreamTestRequest.cpp',
+            'testing/ReadableStreamTestRequest.h',
+            'testing/ReadableStreamTestSource.h',
             'testing/RefCountedScriptWrappable.cpp',
             'testing/RefCountedScriptWrappable.h',
             'testing/TypeConversions.h',
             'testing/UnionTypesTest.cpp',
             'testing/UnionTypesTest.h',
             'testing/v8/WebCoreTestSupport.cpp',
             'testing/v8/WebCoreTestSupport.h',
         ],
         'core_unittest_files': [
             'animation/AnimationClockTest.cpp',
@@ skipping 158 matching lines @@
             'style/OutlineValueTest.cpp',
             'style/SVGComputedStyleTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }