[Webkit-unassigned] [Bug 255200] New: Implement VisibilityStateEntry

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=255200

            Bug ID: 255200
           Summary: Implement VisibilityStateEntry
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Page Loading
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: noam at webkit.org
                CC: beidson at apple.com

VisibilityStateEntry is a new performance timeline entry type that tracks page visibility changes. It helps correlate other performance timeline entries with environment state.
New spec change: https://github.com/whatwg/html/pull/8206

See tests: https://wpt.fyi/results/page-visibility/visibility-state-entry.tentative.html?label=experimental&label=master&aligned

Actual results:

The above tests fail

Expected results:

The above tests should succeed

Corresponding Mozilla bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1827127
Corresponding Chromium bug: https://bugs.chromium.org/p/chromium/issues/detail?id=1103451
Spec PR: https://github.com/whatwg/html/pull/8206

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