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Fix assumption in NGPaintFragment::InkOverflow where it would return the
self ink overflow, rather than the content overflow, if there is a mask.
This is incorrect for line boxes as those only have content ink overflow
causing foreground painting to be skipped, due to the culled rect logic.

Bug: 967567
Test: web_tests/fast/css/webkit-mask-image-painting.html
Change-Id: I5f52d6752fbeae1b25a0397dc4bcff5d8a8de281
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1633314
Commit-Queue: Emil A Eklund <eae@chromium.org>
Reviewed-by: Aleks Totic <atotic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664472}