[SOUP] Missing ResourceRequest members encoded/decoded
https://bugs.webkit.org/show_bug.cgi?id=138694

Reviewed by Sergio Villar Senin.

At least timeoutInterval and priority should also be
encoded/decoded. This fixes all http/tests/xmlhttprequest/timeout/
tests when using the network process, since the timeout is always
0 for all requests that we send to the network process.

* Shared/soup/WebCoreArgumentCodersSoup.cpp:
(IPC::ArgumentCoder<ResourceRequest>::encodePlatformData):
(IPC::ArgumentCoder<ResourceRequest>::decodePlatformData):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@176071 268f45cc-cd09-0410-ab3c-d52691b4dbfc