[Beacon] Content extensions should be able to intercept Beacon / Ping redirects

[Beacon] Content extensions should be able to intercept Beacon / Ping redirects
https://bugs.webkit.org/show_bug.cgi?id=175746
<rdar://problem/33946050>

Reviewed by Alex Christensen.

Source/WebCore:

Update PingLoad to process content extension rules upon redirect. This allows content
extensions to block and upgrade to HTTPS beacon / ping loads.

Because ping loads can outlive the WebProcess, the content extensions rules are passed
to the NetworkProcess when starting the Ping load. The PingLoad can then consult those
rules upon redirect, on the NetworkProcess side.

Tests: http/wpt/beacon/contentextensions/beacon-blocked.html
       http/wpt/beacon/contentextensions/beacon-redirect-blocked.html

* contentextensions/ContentExtensionActions.h:
* contentextensions/ContentExtensionsBackend.cpp:
(WebCore::ContentExtensions::ContentExtensionsBackend::forEach):
(WebCore::ContentExtensions::ContentExtensionsBackend::processContentExtensionRulesForPingLoad):
* contentextensions/ContentExtensionsBackend.h:
* page/Page.h:
* page/UserContentProvider.cpp:
(WebCore::UserContentProvider::forEachContentExtension):
* page/UserContentProvider.h:

Source/WebKit:

Update PingLoad to process content extension rules upon redirect. This allows content
extensions to block and upgrade to HTTPS beacon / ping loads.

Because ping loads can outlive the WebProcess, the content extensions rules are passed
to the NetworkProcess when starting the Ping load. The PingLoad can then consult those
rules upon redirect, on the NetworkProcess side.

* NetworkProcess/NetworkResourceLoadParameters.cpp:
(WebKit::NetworkResourceLoadParameters::encode const):
(WebKit::NetworkResourceLoadParameters::decode):
* NetworkProcess/NetworkResourceLoadParameters.h:
* NetworkProcess/PingLoad.cpp:
(WebKit::PingLoad::willPerformHTTPRedirection):
(WebKit::PingLoad::contentExtensionsBackend):
(WebKit::PingLoad::processContentExtensionRulesForLoad):
* NetworkProcess/PingLoad.h:
* WebProcess/Network/WebLoaderStrategy.cpp:
(WebKit::WebLoaderStrategy::startPingLoad):

LayoutTests:

Add layout test coverage for blocking beacon loads via content extensions.

* http/wpt/beacon/connect-src-beacon-redirect-blocked.sub-expected.txt:
* http/wpt/beacon/connect-src-beacon-redirect-blocked.sub.html:
* http/wpt/beacon/contentextensions/beacon-blocked-expected.txt: Added.
* http/wpt/beacon/contentextensions/beacon-blocked.html: Added.
* http/wpt/beacon/contentextensions/beacon-blocked.html.json: Added.
* http/wpt/beacon/contentextensions/beacon-redirect-blocked-expected.txt: Added.
* http/wpt/beacon/contentextensions/beacon-redirect-blocked.html: Added.
* http/wpt/beacon/contentextensions/beacon-redirect-blocked.html.json: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@220996 268f45cc-cd09-0410-ab3c-d52691b4dbfc