The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0ab5bebc6d97953cf7ee417a80cf453a5145dd8e

commit 0ab5bebc6d97953cf7ee417a80cf453a5145dd8e
Author: robhogan <robhogan@gmail.com>
Date: Tue Dec 20 23:00:48 2016

Content of cell should avoid repeating headers when it straddles multiple pages

The right thing to do here is not covered by the spec, so for now just fix
our rendering bug by doing what firefox does.

Opened a discussion at https://lists.w3.org/Archives/Public/www-style/2016Dec/0070.html.

BUG= 675453 

Review-Url: https://codereview.chromium.org/2587673003
Cr-Commit-Position: refs/heads/master@{#439906}

[add] https://crrev.com/0ab5bebc6d97953cf7ee417a80cf453a5145dd8e/third_party/WebKit/LayoutTests/fragmentation/single-line-cells-repeating-thead-cell-straddles-page-expected.html
[add] https://crrev.com/0ab5bebc6d97953cf7ee417a80cf453a5145dd8e/third_party/WebKit/LayoutTests/fragmentation/single-line-cells-repeating-thead-cell-straddles-page.html
[modify] https://crrev.com/0ab5bebc6d97953cf7ee417a80cf453a5145dd8e/third_party/WebKit/Source/core/layout/LayoutBox.cpp
[modify] https://crrev.com/0ab5bebc6d97953cf7ee417a80cf453a5145dd8e/third_party/WebKit/Source/core/layout/LayoutTableRow.cpp
[modify] https://crrev.com/0ab5bebc6d97953cf7ee417a80cf453a5145dd8e/third_party/WebKit/Source/core/layout/LayoutTableRow.h
[modify] https://crrev.com/0ab5bebc6d97953cf7ee417a80cf453a5145dd8e/third_party/WebKit/Source/core/layout/LayoutTableSection.cpp