Don't always full invalidation on 'position' style change

Don't always full invalidation on 'position' style change

Move position changed case from
RenderStyle::diffNeedsFullLayoutAndPaintInvalidation()
to RenderStyle::diffNeedsFullLayout().

Our layout code can issue invalidations if actually needed.

BUG=408697
TEST=fast/repaint/position-change-keeping-geometry.html

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=181423

[Xianzhu, 2014-09-03 22:18:11]

wangxianzhu@chromium.org changed reviewers:
+ dsinclair@chromium.org, jchaffraix@chromium.org, leviw@chromium.org

[Xianzhu, 2014-09-03 22:18:12]

Note that this CL needs https://codereview.chromium.org/538613003/ to work.

[dsinclair, 2014-09-04 14:12:48]

lgtm

[Julien - ping for review, 2014-09-04 17:57:52]

The CQ bit was checked by jchaffraix@chromium.org

[Julien - ping for review, 2014-09-04 17:57:53]

lgtm

[commit-bot: I haz the power, 2014-09-04 17:58:28]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/wangxianzhu@chromium.org/536183002/20001

[Xianzhu, 2014-09-04 17:59:33]

The CQ bit was unchecked by wangxianzhu@chromium.org

[Xianzhu, 2014-09-04 23:12:05]

The CQ bit was checked by wangxianzhu@chromium.org

[commit-bot: I haz the power, 2014-09-04 23:12:36]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/wangxianzhu@chromium.org/536183002/20001

[commit-bot: I haz the power, 2014-09-05 00:23:37]

Committed patchset #2 (id:20001) as 181423