Fix container dimension: get actual width/height from the view element
Fix container dimension: get actual width/height from the view element

We query the actual width and height of the content area of the container using a probe element and set them to the container object, since using width/height values calculated with `container.border*` sometimes leads to incorrect layout since Chrome round border width values to integer.

vivliostyle/vivliostyle.js,vivliostyle/vivliostyle.js,vivliostyle/vivliostyle.js,vivliostyle/vivliostyle.js