Move m_pageLogicalOffset from LayoutBlock to LayoutBoxRareData.

Move m_pageLogicalOffset from LayoutBlock to LayoutBoxRareData.

This is about as rare as all the other pagination things, and, furthermore, in
the future, we're going to need this piece of information in other LayoutBox
derived classes than LayoutBlock, such as e.g. LayoutTableRow.

R=jchaffraix@chromium.org,leviw@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=195642

[leviw_travelin_and_unemployed, 2015-05-20 21:23:44]

lgtm

https://codereview.chromium.org/1148833002/diff/20001/Source/core/layout/Layo...
File Source/core/layout/LayoutBox.h (right):

https://codereview.chromium.org/1148833002/diff/20001/Source/core/layout/Layo...
Source/core/layout/LayoutBox.h:460: // direction (so an x-offset in vertical
text and a y-offset for horizontal text).
Mega-Nit-feel-free-to-ignore: I may describe the common case first (horizontal
text).

[mstensho (USE GERRIT), 2015-05-20 21:47:32]

https://codereview.chromium.org/1148833002/diff/20001/Source/core/layout/Layo...
File Source/core/layout/LayoutBox.h (right):

https://codereview.chromium.org/1148833002/diff/20001/Source/core/layout/Layo...
Source/core/layout/LayoutBox.h:460: // direction (so an x-offset in vertical
text and a y-offset for horizontal text).
On 2015/05/20 21:23:44, leviw wrote:
> Mega-Nit-feel-free-to-ignore: I may describe the common case first (horizontal
> text).

That would have been better, but since I just moved this comment from the other
place, I'll leave it alone for now.

[mstensho (USE GERRIT), 2015-05-20 21:47:37]

The CQ bit was checked by mstensho@opera.com

[commit-bot: I haz the power, 2015-05-20 21:48:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1148833002/20001

[commit-bot: I haz the power, 2015-05-20 21:52:50]

Committed patchset #2 (id:20001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=195642