Use normal loading path for ping loads

Use normal loading path for ping loads
https://bugs.webkit.org/show_bug.cgi?id=196807

Reviewed by Alex Christensen.

LayoutTests/imported/w3c:

* web-platform-tests/beacon/headers/header-content-type-expected.txt:

Source/WebCore:

Make use of regular code path for ping loads and beacon.
This is done conditionally on KeepAlive flag.
The benefits are a single loading code path and service worker interception.

For that purpose, introduce a LoaderStrategy switch based on KeepAlive runtime flag.
This switch is used to use ping loads when keepAlive is set or regular loads.
In case of regular loads, the keepAlive flag should be used to extend the lifetime of the load.

Migrate ping loads to use CachedResourceLoader instead of PingLoad.
For that purpose, introduce a new Ping CachedResource type.

Covered by existing tests.

* Modules/beacon/NavigatorBeacon.cpp:
(WebCore::NavigatorBeacon::sendBeacon):
* inspector/agents/InspectorPageAgent.cpp:
(WebCore::InspectorPageAgent::inspectorResourceType):
* loader/LinkLoader.cpp:
(WebCore::createLinkPreloadResourceClient):
* loader/LoaderStrategy.h:
* loader/PingLoader.cpp:
(WebCore::PingLoader::loadImage):
(WebCore::PingLoader::sendPing):
(WebCore::PingLoader::sendViolationReport):
(WebCore::PingLoader::startPingLoad):
* loader/PingLoader.h:
* loader/ResourceLoadInfo.cpp:
(WebCore::toResourceType):
* loader/SubresourceLoader.cpp:
(WebCore::logResourceLoaded):
* loader/cache/CachedResource.cpp:
(WebCore::CachedResource::defaultPriorityForResourceType):
(WebCore::CachedResource::load):
(WebCore::CachedResource::cancelLoad):
* loader/cache/CachedResource.h:
(WebCore::CachedResource::shouldUsePingLoad):
(WebCore::CachedResource::isMainOrMediaOrIconOrRawResource const):
* loader/cache/CachedResourceLoader.cpp:
(WebCore::createResource):
(WebCore::CachedResourceLoader::requestPingResource):
(WebCore::contentTypeFromResourceType):
(WebCore::CachedResourceLoader::checkInsecureContent const):
(WebCore::CachedResourceLoader::allowedByContentSecurityPolicy const):
(WebCore::CachedResourceLoader::canRequest):
(WebCore::isResourceSuitableForDirectReuse):
(WebCore::destinationForType):
* loader/cache/CachedResourceLoader.h:

Source/WebKit:

In case a NetworkResourceLoader has the keepAlive option we do the following:
- Always use NetworkLoadChecker as we might need it to do checks after the Web context is gone.
- In case of aborting a KeepAlive loader, remove it from NetworkConnectionToWebProcess map
and add it to a kept-alive NetworkSession load set. The loader is only kept alive if it
has not yet received a response. Mark the loader as kept-alive.
- In case loader is kept-alive, cancel the load as soon as a response is gathered.

* NetworkProcess/NetworkConnectionToWebProcess.cpp:
(WebKit::NetworkConnectionToWebProcess::transferKeptAliveLoad):
* NetworkProcess/NetworkConnectionToWebProcess.h:
* NetworkProcess/NetworkProcess.cpp:
(WebKit::NetworkProcess::addKeptAliveLoad):
(WebKit::NetworkProcess::removeKeptAliveLoad):
* NetworkProcess/NetworkProcess.h:
* NetworkProcess/NetworkResourceLoadMap.cpp:
(WebKit::NetworkResourceLoadMap::remove):
(WebKit::NetworkResourceLoadMap::take):
* NetworkProcess/NetworkResourceLoadMap.h:
* NetworkProcess/NetworkResourceLoader.cpp:
(WebKit::m_shouldCaptureExtraNetworkLoadMetrics):
(WebKit::NetworkResourceLoader::cleanup):
(WebKit::NetworkResourceLoader::abort):
(WebKit::NetworkResourceLoader::didReceiveResponse):
(WebKit::NetworkResourceLoader::continueWillSendRedirectedRequest):
* NetworkProcess/NetworkResourceLoader.h:
* WebProcess/Network/WebLoaderStrategy.cpp:
(WebKit::maximumBufferingTime):
(WebKit::WebLoaderStrategy::usePingLoad const):
* WebProcess/Network/WebLoaderStrategy.h:

LayoutTests:

* TestExpectations:
* http/tests/blink/sendbeacon/beacon-cross-origin.https-expected.txt:
* http/tests/blink/sendbeacon/connect-src-beacon-allowed.html:
* http/tests/security/contentSecurityPolicy/connect-src-beacon-allowed.html:
* http/tests/security/contentSecurityPolicy/report-only-connect-src-beacon-redirect-blocked-expected.txt:
* http/tests/security/contentSecurityPolicy/report-only-connect-src-beacon-redirect-blocked.php:
* http/tests/security/contentSecurityPolicy/user-style-sheet-font-crasher-expected.txt:
* http/wpt/beacon/beacon-async-error-logging-expected.txt:
* http/wpt/beacon/beacon-async-error-logging.html:
* http/wpt/beacon/connect-src-beacon-redirect-blocked.sub-expected.txt:
* http/wpt/beacon/contentextensions/beacon-redirect-blocked-expected.txt:
* http/wpt/beacon/resources/beacon-preflight.py:
(respondToCORSPreflight):
(main):
* platform/wk2/http/tests/security/contentSecurityPolicy/block-all-mixed-content/insecure-css-in-iframe-report-only-expected.txt:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@244700 268f45cc-cd09-0410-ab3c-d52691b4dbfc