[Webkit-unassigned] [Bug 161088] New: WPT Resource Timing tests fails under some conditions

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=161088

            Bug ID: 161088
           Summary: WPT Resource Timing tests fails under some conditions
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: johan_jensen at apple.com
                CC: lforschler at apple.com

The Resource Timing tests included as part of the W3C Web Platform Tests are flaky under an upcoming patch for issue 161068.
The tests fails under these two circumstances:

1)
When PerformanceResourceTiming is created with a null ResourceResponse. This happens when memoryCache.resourceForRequest(..) (inside CachedResourceLoader::requestResource) returns a resource whose response (resource->response()) is null.

2)
When the onreadystatechange callback of an XHR or the onload callback of an added stylesheet is called, before the resource timing entry has been added to the timeline.

The imported/w3c/web-platform-tests/resource-timing/resource-timing.html test will occasionally run into one of the above cases and fail the test.

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