[Webkit-unassigned] [Bug 78318] New: Make ShadowRoot DoublyLinkedList-able.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=78318

           Summary: Make ShadowRoot DoublyLinkedList-able.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: hayato at chromium.org
                CC: dglazkov at chromium.org, rolandsteiner at chromium.org,
                    dominicc at chromium.org, morrita at google.com,
                    shinyak at chromium.org
            Blocks: 76433


To support multiple ShadowRoots, we have to update ShadowRoot so that it can be a node of DoublyLinkedList.

We need doubly since:
  - We have to traverse to youngerShadowRoot when we move back to the insertion point, <shadow>, from node which is direct child of older ShadowRoot.
  - We have to traverse to olderShadowRoot when we encounter <shadow> element.

Upcoming changes require this change.

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