Use the containing block to compute the pagination gap when the container is inline.

Use the containing block to compute the pagination gap when the container is inline.
https://bugs.webkit.org/show_bug.cgi?id=184724
<rdar://problem/39521800>

Reviewed by Simon Fraser.

Source/WebCore:

Test: fast/overflow/page-overflow-with-inline-body-crash.html

* page/FrameView.cpp:
(WebCore::FrameView::applyPaginationToViewport):

LayoutTests:

* fast/overflow/page-overflow-with-inline-body-crash-expected.txt: Added.
* fast/overflow/page-overflow-with-inline-body-crash.html: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@231379 268f45cc-cd09-0410-ab3c-d52691b4dbfc