[WPE][GTK] Pass full certificate chain in CertificateInfo coder

[WPE][GTK] Pass full certificate chain in CertificateInfo coder
https://bugs.webkit.org/show_bug.cgi?id=190789

Reviewed by Michael Catanzaro.

When the network process serializes certificate data to other
processes through the argument coders, the certificate chain, if
present, is lost. In practice this means that applications using
the public API to process certificate info have no details on the
certificate chain, other than the very basics included in the
certificate. Serialize the entire chain if available in the
certificate.

Source/WebKit:

* Shared/soup/WebCoreArgumentCodersSoup.cpp:
(IPC::ArgumentCoder<CertificateInfo>::encode): Encode the
certificate chain if present.
(IPC::ArgumentCoder<CertificateInfo>::decode): Decode the
entire certificate chain and rebuild it.

Tools:

* TestWebKitAPI/Tests/WebKitGLib/TestSSL.cpp:
(testSSL): Test that the self-signed certificate has no bogus
issuer certificate.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@237351 268f45cc-cd09-0410-ab3c-d52691b4dbfc