Normalize font BBox to make sure it's correct when rendering a PDF on the mac.
Normalize font BBox to make sure it's correct when rendering a PDF on the mac.

Original CL by abodenha@chromium.org: https://codereview.appspot.com/6501049/
BUG=crbug.com/124572

Review URL: https://codereview.appspot.com/6492048

csulmone/skia,csulmone/skia,csulmone/skia,csulmone/skia