[macOS] Show more accurate names for child processes in Activity Monitor

https://bugs.webkit.org/show_bug.cgi?id=256174
rdar://102152759

Reviewed by Per Arne Vollan and Tim Horton.

See radar for more information.

* Source/WebKit/UIProcess/Launcher/cocoa/ProcessLauncherCocoa.mm:
(WebKit::ProcessLauncher::launchProcess):

Canonical link: https://commits.webkit.org/263588@main

Source/WebKit/UIProcess/Launcher/cocoa/ProcessLauncherCocoa.mm

@@ -179,7 +179,11 @@
     xpc_dictionary_set_string(bootstrapMessage.get(), "client-identifier", !clientIdentifier.isEmpty() ? clientIdentifier.utf8().data() : *_NSGetProgname());
     xpc_dictionary_set_string(bootstrapMessage.get(), "client-bundle-identifier", WebCore::applicationBundleIdentifier().utf8().data());
     xpc_dictionary_set_string(bootstrapMessage.get(), "process-identifier", String::number(m_launchOptions.processIdentifier.toUInt64()).utf8().data());
+#if PLATFORM(MAC)
+    xpc_dictionary_set_string(bootstrapMessage.get(), "ui-process-name", [[[NSRunningApplication currentApplication] localizedName] UTF8String]);
+#else
     xpc_dictionary_set_string(bootstrapMessage.get(), "ui-process-name", [[[NSProcessInfo processInfo] processName] UTF8String]);
+#endif
     xpc_dictionary_set_string(bootstrapMessage.get(), "service-name", name);
 
     if (m_launchOptions.processType == ProcessLauncher::ProcessType::Web) {