Assertion failure in createWebViewWithRequest when running imported/w…

…3c/web-platform-tests/shadow-dom/crashtests/move-to-new-tree-1343016.html

https://bugs.webkit.org/show_bug.cgi?id=255665

Reviewed by Chris Dumez.

The assertion failure is caused by the test using "test-wait" attribute on the document element
to make the test keep running instead of calling waitUntilDone(). Fixed the bug by relaxing
the assertion to allow this method of waiting.

* Tools/DumpRenderTree/mac/UIDelegate.mm:
(-[UIDelegate webView:createWebViewWithRequest:]):

Canonical link: https://commits.webkit.org/263156@main

Tools/DumpRenderTree/mac/UIDelegate.mm

@@ -34,6 +34,7 @@
 #import "EventSendingController.h"
 #import "MockWebNotificationProvider.h"
 #import "TestRunner.h"
+#import "WPTFunctions.h"
 
 #import <WebKit/WebApplicationCache.h>
 #import <WebKit/WebFramePrivate.h>
@@ -176,7 +177,7 @@ - (WebView *)webView:(WebView *)sender createWebViewWithRequest:(NSURLRequest *)
         return nil;
 
     // Make sure that waitUntilDone has been called.
-    ASSERT(gTestRunner->waitToDump());
+    ASSERT(gTestRunner->waitToDump() || WTR::hasTestWaitAttribute(mainFrame.globalContext));
 
     auto webView = createWebViewAndOffscreenWindow();
     [webView setPreferences:[sender preferences]];