TextBlob: Use deferred bounds if negative letter or word spacing exists.
TextBlob: Use deferred bounds if negative letter or word spacing exists.

This is one case where we can wind up using layout bounds that aren't
appropriate for a visual bounding box. It happens to have the
particularly wrong effect of causing the text blob to be culled
altogether.

BUG=437121

Review URL: https://codereview.chromium.org/778233002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@186648 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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