[LayoutNG] Add NGFragmentBuilderType template param to alg.

This shouldn't have any functional changes.

Bug: 635619
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: I1ad9ee091fadf1fd5eee7d27a0ace92e93f5a0b5
Reviewed-on: https://chromium-review.googlesource.com/719447
Commit-Queue: Ian Kilpatrick <ikilpatrick@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509067}
5 files changed