[Webkit-unassigned] [Bug 187404] Check that LayerTreeHost was created before use

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=187404

--- Comment #2 from Stephan Szabo <stephan.szabo at sony.com> ---
I'm not sure if this is the best way to handle this, but while working on web inspector for wincairo non-legacy, we hit crashes just after this point because LayerTreeHost::create returns nullptr if not USE(COORDINATED_GRAPHICS_THREADED) but this code acts as if it will always get one.

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