Inherit propagation diff necessary for loaded web fonts.

Inherit propagation diff necessary for loaded web fonts.

As the loading status is not part of the RenderStyle equality operator
anymore, we need to explicitly check for the loading status to make the
style propagation diff be different from NoChange. That is necessary to
trigger a call to RenderObject::setStyle which in turn will call
visualInvalidationDiff that will trigger a layout/paint for the loaded
font.

This is a regression from r186572.

R=eae@chromium.org
BUG=440271
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=186801

[rune, 2014-12-09 15:32:09]

PTAL

[eae, 2014-12-09 18:37:06]

LGTM

[eae, 2014-12-09 18:37:08]

The CQ bit was checked by eae@chromium.org

[commit-bot: I haz the power, 2014-12-09 18:37:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/790823003/1

[commit-bot: I haz the power, 2014-12-09 19:50:51]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=186801