[New Multicolumn] Let updatePagination() do its job also when composited.

[New Multicolumn] Let updatePagination() do its job also when composited.

Otherwise, layers inside multicol will become non-paginated if relaid out
after initial paint.

BUG=359877
R=jchaffraix@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=184012

[Julien - ping for review, 2014-10-20 15:52:37]

lgtm

https://codereview.chromium.org/660793002/diff/1/Source/core/rendering/Render...
File Source/core/rendering/RenderLayer.cpp (right):

https://codereview.chromium.org/660793002/diff/1/Source/core/rendering/Render...
Source/core/rendering/RenderLayer.cpp:476: bool regionBasedColumnsUsed =
useRegionBasedColumns();
Style: boolean should have a conjugated verb in them so it should be
isRegionBasedColumnUsed or to match the caller better usesRegionBasedColumn.

[mstensho (USE GERRIT), 2014-10-20 18:54:31]

https://codereview.chromium.org/660793002/diff/1/Source/core/rendering/Render...
File Source/core/rendering/RenderLayer.cpp (right):

https://codereview.chromium.org/660793002/diff/1/Source/core/rendering/Render...
Source/core/rendering/RenderLayer.cpp:476: bool regionBasedColumnsUsed =
useRegionBasedColumns();
On 2014/10/20 15:52:36, Julien Chaffraix - PST wrote:
> Style: boolean should have a conjugated verb in them so it should be
> isRegionBasedColumnUsed or to match the caller better usesRegionBasedColumn.

Done.

[mstensho (USE GERRIT), 2014-10-20 18:54:37]

The CQ bit was checked by mstensho@opera.com

[commit-bot: I haz the power, 2014-10-20 18:55:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/660793002/20001

[commit-bot: I haz the power, 2014-10-20 20:30:06]

Committed patchset #2 (id:20001) as 184012