If a document has an empty rect for whatever reason (in the case observed, this was
due to running a full screen video in the content document, which occludes the
chrome document), then we still want to ensure that we build a frame if the
texture cache has performed a clear, as otherwise we may try to access stale
items from the texture resolver in render_impl.
Differential Revision: https://phabricator.services.mozilla.com/D29848
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extra : moz-landing-system : lando
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