[Readable Streams API] Add ReadableByteStreamController byobRequest attribute

[Readable Streams API] Add ReadableByteStreamController byobRequest attribute
https://bugs.webkit.org/show_bug.cgi?id=168319

Patch by Romain Bellessort <romain.bellessort@crf.canon.fr> on 2017-02-20
Reviewed by Youenn Fablet.

LayoutTests/imported/w3c:

Updated expectations for imported w3c tests (new type of error is now obtained).

* web-platform-tests/streams/readable-byte-streams/general-expected.txt: Updated.
* web-platform-tests/streams/readable-byte-streams/general.dedicatedworker-expected.txt: Updated.

Source/WebCore:

Added ReadableByteStreamController byobRequest attribute.

Added tests related to ReadableStreamBYOBRequest as a dedicated object
and also as an attribute of ReadableByteStreamController.

* CMakeLists.txt: Added new files.
* DerivedSources.cpp: Added new files.
* DerivedSources.make: Added new files.
* Modules/streams/ReadableByteStreamController.idl: Added byobRequest support.
* Modules/streams/ReadableByteStreamController.js: Added byobRequest support.
* Modules/streams/ReadableByteStreamInternals.js:
(privateInitializeReadableStreamBYOBRequest): Added constructor.
* Modules/streams/ReadableStreamBYOBRequest.idl: Added.
* Modules/streams/ReadableStreamBYOBRequest.js: Added.
(respond): Not implemented yet.
(respondWithNewView): Not implemented yet.
(view): Not implemented yet.
* WebCore.xcodeproj/project.pbxproj: Added new files.
* bindings/js/JSDOMGlobalObject.cpp: Added ReadableStreamBYOBRequest support.
(WebCore::JSDOMGlobalObject::addBuiltinGlobals):
(WebCore::JSDOMGlobalObject::finishCreation):
(WebCore::JSDOMGlobalObject::visitChildren):
* bindings/js/JSReadableStreamPrivateConstructors.cpp: Added ReadableStreamBYOBRequest support.
(WebCore::constructJSReadableByteStreamController):
(WebCore::constructJSReadableStreamBYOBRequest):
(WebCore::JSBuiltinReadableStreamBYOBRequestPrivateConstructor::initializeExecutable):
(WebCore::createReadableStreamBYOBRequestPrivateConstructor):
* bindings/js/JSReadableStreamPrivateConstructors.h: Added ReadableStreamBYOBRequest support.
* bindings/js/WebCoreBuiltinNames.h: Added ReadableStreamBYOBRequest support.

LayoutTests:

Added tests related to ReadableStreamBYOBRequest as a dedicated object
and also as an attribute of ReadableByteStreamController.

* streams/readable-byte-stream-controller.js: Updated with byobRequest attribute test.
* streams/readable-stream-byob-request-expected.txt: Added.
* streams/readable-stream-byob-request.html: Added.
* streams/readable-stream-byob-request.js: Added to cover tests related to ReadableStreamBYOBRequest.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@212656 268f45cc-cd09-0410-ab3c-d52691b4dbfc