Introduce TestWebKitAPI mechanism for directly testing IPC serialization

[beidson]

d9fd3e0

Introduce TestWebKitAPI mechanism for directly testing IPC serialization
https://bugs.webkit.org/show_bug.cgi?id=263703
rdar://117511848

Reviewed by Alex Christensen.

This patch introduces a framework to directly test serialization of object types that we know
we need to support coding for IPC, but might not have any indirect way to test.

The testing leverages IPC's support for MessageSenders to work without an IPC::Connection.
That support was originally added to support generated messages and encoding to our daemons,
but reusing it here fits nicely.

By using a test-specific MessageSender and sendWithAsyncReplyWithoutUsingIPCConnection, we coax
CoreIPC into encoding a message and decoding a reply the same way it does for actual IPC messaging.

The prime use-case for this technique is testing our Objective-C types as found in ArgumentCodersCocoa.mm
The CoreFoundation types in ArgumentCodersCF.mm are also a nice fit.

For the sake of introducing the mechanism at a high level, this patch only tests serialization of NSString.
With this framework introduced, testing other types will be trivial.

* Source/WebKit/Shared/Cocoa/CoreIPCData.serialization.in:
* Source/WebKit/Shared/WebCoreArgumentCoders.serialization.in:
* Source/WebKit/WebKit.xcodeproj/project.pbxproj:
* Tools/TestWebKitAPI/Configurations/TestWebKitAPI.xcconfig:
* Tools/TestWebKitAPI/SourcesCocoa.txt:
* Tools/TestWebKitAPI/TestWebKitAPI.xcodeproj/project.pbxproj:
* Tools/TestWebKitAPI/Tests/WebKitCocoa/IPCSerialization.mm: Added.
(ObjCSerializationTester::performSendWithAsyncReplyWithoutUsingIPCConnection const):
(ObjCHolderForTesting::encode const):
(ObjCHolderForTesting::decode):
(operator==):
(BasicPingBackMessage::name):
(BasicPingBackMessage::asyncMessageReplyName):
(BasicPingBackMessage::BasicPingBackMessage):
(BasicPingBackMessage::arguments):
(TEST):

Canonical link: https://commits.webkit.org/269802@main

32563fb

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 wincairo
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	🧪 wpe-wk2
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🛠 gtk
	🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🧪 api-gtk
	✅ 🛠 tv	🧪 mac-AS-debug-wk2
	✅ 🛠 tv-sim
✅ 🛠 🧪 merge	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on current version of this PR (hash 32563fb)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 wincairo
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	🧪 wpe-wk2
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🛠 gtk
	🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🧪 api-gtk
	✅ 🛠 tv	🧪 mac-AS-debug-wk2
	✅ 🛠 tv-sim
✅ 🛠 🧪 merge	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-commit-queue]

Committed 269802@main (d9fd3e0): https://commits.webkit.org/269802@main

Reviewed commits have been landed. Closing PR #19579 and removing active labels.