Fix problems with StaticLayout indentation

The implementation of indendataion had two issues. First, the indent
pattern would restart on a new paragraph, which created problems when
a multi-paragraph text would flow into a shape. Second, the indents
didn't affect drawing position, which is ok for centered text but not
most of the other alignments. This patch fixes both.

Bug: 21904268
Change-Id: I53a3eb1c192fc0f8f0beace304832eed61b38497