Add spacingDisabled() check to ShapeResultSpacing

SVGTextLayoutEngine applies letter-spacing and word-spacing itself, so
without this we'd apply the spacing properties twice.
This is essentially a bandaid work-around, until we can figure out how
to handle this in a better way.

BUG=583298

Review URL: https://codereview.chromium.org/1827083002

Cr-Commit-Position: refs/heads/master@{#383078}
2 files changed