Rename acceleratedCompositingForFixedPosition to preferCompositingToLCDText.

Rename acceleratedCompositingForFixedPosition to preferCompositingToLCDText.

This adds a preferCompositingToLCDText setting, and makes it be set by the
setAcceleratedCompositingForFixedPositionEnabled() WebSettings method so
that behaviour is not changed. Next, Chromium will be changed to call
setPreferCompositingToLCDTextEnabled instead so we can remove this method
from settings.

Later, other accelerated compositing trigger settings will be merged with
preferCompositingToLCDText.

R=abarth
BUG=365851
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=180392

[abarth-chromium, 2014-08-15 19:52:55]

LGTM

[danakj, 2014-08-15 19:57:19]

The CQ bit was checked by danakj@chromium.org

[commit-bot: I haz the power, 2014-08-15 19:57:53]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/danakj@chromium.org/476273003/1

[commit-bot: I haz the power, 2014-08-15 21:00:02]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  linux_blink_dbg on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/linux_blink_dbg/builds/2...)
  linux_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/linux_blink_rel/builds/2...)
  mac_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/mac_blink_rel/builds/20003)
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/22983)

[danakj, 2014-08-15 21:03:03]

The CQ bit was checked by danakj@chromium.org

[commit-bot: I haz the power, 2014-08-15 21:03:09]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/danakj@chromium.org/476273003/20001

[commit-bot: I haz the power, 2014-08-15 22:18:24]

Committed patchset #2 (20001) as 180392