[Fetch API] Response should keep all ResourceResponse information

[Fetch API] Response should keep all ResourceResponse information
https://bugs.webkit.org/show_bug.cgi?id=175099

Patch by Youenn Fablet <youenn@apple.com> on 2017-08-05
Reviewed by Sam Weinig.

Source/WebCore:

No change of behavior, covered by existing tests.

Disabling filtering of resource response at DocumentThreadableLoader for fetch API and doing the filtering at FetchResponse level.
This requires passing the tainting parameter to FetchResponse. For that purpose, we store the tainting on the ResourceResponse itself.
This allows mimicking the concept of internal response from the fetch spec.
This might be useful for future developments related to caching the responses.

The body is now also stored in FetchResponse so a flag is added to ensure we only expose the body if allowed.

Changing storage of opaque redirect information to keep the redirection information in the response.

* Modules/fetch/FetchBodyOwner.cpp:
(WebCore::FetchBodyOwner::blob):
(WebCore::FetchBodyOwner::consumeNullBody):
* Modules/fetch/FetchBodyOwner.h:
* Modules/fetch/FetchLoader.cpp:
(WebCore::FetchLoader::start):
* Modules/fetch/FetchResponse.cpp:
(WebCore::FetchResponse::BodyLoader::didReceiveResponse):
(WebCore::FetchResponse::consume):
(WebCore::FetchResponse::consumeBodyAsStream):
(WebCore::FetchResponse::createReadableStreamSource):
* Modules/fetch/FetchResponse.h:
* loader/DocumentThreadableLoader.cpp:
(WebCore::DocumentThreadableLoader::responseReceived):
(WebCore::DocumentThreadableLoader::didReceiveResponse):
(WebCore::DocumentThreadableLoader::didFinishLoading):
(WebCore::DocumentThreadableLoader::loadRequest):
* loader/DocumentThreadableLoader.h:
* loader/SubresourceLoader.cpp:
(WebCore::SubresourceLoader::willSendRequestInternal):
* loader/cache/CachedResource.cpp:
(WebCore::CachedResource::setBodyDataFrom):
(WebCore::CachedResource::setResponse):
* platform/network/ResourceResponseBase.cpp:
(WebCore::ResourceResponseBase::crossThreadData const):
(WebCore::ResourceResponseBase::fromCrossThreadData):
(WebCore::ResourceResponseBase::filter):
* platform/network/ResourceResponseBase.h:
(WebCore::ResourceResponseBase::setTainting):
(WebCore::ResourceResponseBase::tainting const):
(WebCore::ResourceResponseBase::encode const):
(WebCore::ResourceResponseBase::decode):

LayoutTests:

Updating test now that we are no longer cancelling the load in case of opaque responses.

* http/tests/inspector/network/fetch-network-data-expected.txt:
* http/tests/inspector/network/fetch-network-data.html:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@220320 268f45cc-cd09-0410-ab3c-d52691b4dbfc