https://bugs.webkit.org/show_bug.cgi?id=95161

Reviewed by Anders Carlsson.

Source/WebKit2:

Replace the WebKit2Service with two new XPC services, the WebProcessService, which is only used
when installed on the system, and the WebProcessServiceForWebKitDevelopment which is used at all
other times. We need both services because XPC can't in general be configured to have a custom
environment at runtime, and thus WebProcessServiceForWebKitDevelopment has the ability to re-exec
itself into a desired state. That capability is rather undesirable for installed usage, where we
don't want to allow arbitrary changes to the environment of the service, which would allow breaking
the App Sandbox.

* Configurations/WebProcessService.xcconfig: Copied from Source/WebKit2/Configurations/WebKit2Service.xcconfig.
* Configurations/WebProcessServiceForWebKitDevelopment.xcconfig: Renamed from Source/WebKit2/Configurations/WebKit2Service.xcconfig.
Add new configuration files.

* Platform/mac/WorkQueueMac.cpp:
(WorkQueue::registerMachPortEventHandler):
(WorkQueue::unregisterMachPortEventHandler):
Add helpful assertions. Without them, we confusingly crash a bit later in HashTable code.

* UIProcess/Launcher/mac/ProcessLauncherMac.mm:
(WebKit::addDYLDEnvironmentAdditions):
Factor out environment additions to this helper function.

(WebKit::connectToWebProcessServiceForWebKitDevelopment):
(WebKit::createWebProcessServiceForWebKitDevelopment):
Add functionality to setup the webkit development service via re-exec.

(WebKit::createWebProcessService):
Add functionality to connect to the installed WebProcess service.

(WebKit::createProcess):
Factor out posix_spawn based launching into this helper function.

(WebKit::ProcessLauncher::launchProcess):
Call the correct process creation function based on launch data and install state.

* WebKit2.xcodeproj/project.pbxproj:
Add new files to the project.

* WebProcess/mac/WebProcessServiceEntryPoints.h: Renamed from Source/WebKit2/WebProcess/mac/WebProcessXPCServiceMain.h.
* WebProcess/mac/WebProcessServiceEntryPoints.mm: Renamed from Source/WebKit2/WebProcess/mac/WebProcessXPCServiceMain.mm.
(WebKit::WebProcessServiceEventHandler):
(WebProcessServiceMain):
(InitializeWebProcessForWebProcessServiceForWebKitDevelopment):
Rename to WebProcessServiceEntryPoints since this is now used for both the WebProcessService and the
WebProcessServiceForWebKitDevelopment.

* WebProcessService/Info.plist: Copied from Source/WebKit2/WebKit2Service/Info.plist.
* WebProcessService/WebProcessServiceMain.mm: Renamed from Source/WebKit2/WebKit2Service/MainMacService.mm.
Add main for the WebProcessService which just calls into the WebProcessServiceEntryPoints in WebKit2.framework.

* WebProcessServiceForWebKitDevelopment/Info.plist: Renamed from Source/WebKit2/WebKit2Service/Info.plist.
* WebProcessServiceForWebKitDevelopment/WebProcessServiceForWebKitDevelopmentMain.mm: Added.
Add main for the WebProcessServiceForWebKitDevelopment, which can't just call directly into WebProcessServiceEntryPoints
as the framework path might not be set up correctly. This is also where we re-exec ourselves when required.

Tools:

Remove setting the __XPC_* environment variables.

* Scripts/webkitdirs.pm:
(setUpGuardMallocIfNeeded):
(runMacWebKitApp):
(execMacWebKitAppForDebugging):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@129293 268f45cc-cd09-0410-ab3c-d52691b4dbfc