[Webkit-unassigned] [Bug 252176] New: [css-nesting] Save memory when we only need old-school StyleRule (=non nested)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=252176

            Bug ID: 252176
           Summary: [css-nesting] Save memory when we only need old-school
                    StyleRule (=non nested)
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: m_dubet at apple.com

Support for CSS Nesting adds 2 members to the StyleRule class (the resolved selector list, and the list of children rules).

This creates a regression in Membuster benchmark (~2Mb). 

We should have a "happy path" where we don't pay the memory cost of the nesting feature when we don't need it.

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