[Webkit-unassigned] [Bug 221449] New: Web Inspector: Add `CSS.setGlobalLayoutContextTypeInstrumentationEnabled` for getting information about all layout contexts

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=221449

            Bug ID: 221449
           Summary: Web Inspector: Add
                    `CSS.setGlobalLayoutContextTypeInstrumentationEnabled`
                    for getting information about all layout contexts
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: pangle at apple.com
                CC: inspector-bugzilla-changes at group.apple.com

>From Devin's Review Comment on attachment 419315:
```
As a potential optimization, maybe you could add a `CSS.setGlobalLayoutContextTypeInstrumentationEnabled` that's toggled on inside `WI.LayoutDetailsSidebarPanel.prototype.attached` and off inside `WI.LayoutDetailsSidebarPanel.prototype.detached` which controls whether the `Node` is always instrumented (when toggled on) or if only previously instrumented `Node` are allowed (when toggled off).  This means that until the developer shows the Layout panel, we'd only be getting `CSS.nodeLayoutContextTypeChanged` events for nodes that have been shown in the Elements Tab, which is likely _far_ more performant than if we'd instrumented every potentially viable node.
```

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