Better rendering detection with DirectWrite.

When requesting embedded bitmaps, all sizes in a gridfit gasp range with a
bitmap in that range should be gridfit to the fullest extent possible.

R=eae@chromium.org, reed@google.com, mtklein@google.com

Author: bungeman@google.com

Review URL: https://codereview.chromium.org/341343002
3 files changed