[Webkit-unassigned] [Bug 204395] New: Web Inspector: Canvas: adjust `InspectorCanvasAgent::recordCanvasAction` to actually check that the `CanvasRenderingContext` still exists

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=204395

            Bug ID: 204395
           Summary: Web Inspector: Canvas: adjust
                    `InspectorCanvasAgent::recordCanvasAction` to actually
                    check that the `CanvasRenderingContext` still exists
           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: drousso at apple.com
                CC: inspector-bugzilla-changes at group.apple.com

The microtask we create inside `InspectorCanvasAgent::recordCanvasAction` to handle marking the end of a frame for a detached canvas doesn't actually check that the `CanvasRenderingContext` still exists, such as if the `CanvasRenderingContext` gets GCd during a recording.

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