GitLab

Implement support for computing and populating the GlyphOverflow
structure for the harfbuzz code path. The current implementation is a
straight copy of the current Mac implementation with minor
modifications to use the corresponding harfbuzz APIs.

R=dglazkov@chromium.org,behdad@chromium.org
BUG=354165
TEST=fast/text/international/repaint-glyph-bounds.html

Review URL: https://codereview.chromium.org/205553003

git-svn-id: svn://svn.chromium.org/blink/trunk@169605 bbb929c8-8fbe-4397-9dbb-9b2b20218538