Finish adding remaining manual squashing layout tests.

BUG=315321
R=shawnsingh@chromium.org, vollick@chromium.org

Review URL: https://codereview.chromium.org/160193002

git-svn-id: svn://svn.chromium.org/blink/trunk@167545 bbb929c8-8fbe-4397-9dbb-9b2b20218538