Revert of Remove redundant "layout size changed" state from LayoutSVGRoot

Revert of Remove redundant "layout size changed" state from LayoutSVGRoot (patchset #1 id:1 of https://codereview.chromium.org/2065093002/ )

Reason for revert:
Possible cause of crbug.com/620228

Original issue's description:
> Remove redundant "layout size changed" state from LayoutSVGRoot
>
> In LayoutSVGRoot::layout, two slightly different "layout size changed"
> values are computed - one which is used for propagation to children
> via SVGLayoutSupport::layoutSizeOfNearestViewportChanged
> (|m_isLayoutSizeChanged|), and one which is used to mark direct
> descendant children (local |layoutSizeChanged|).
> Ultimately their use is the same though, so only using the more narrow
> predicate for both of these cases should yield the same result.
> It also has the side-effect of making it more obvious that changes to
> layout-size is only of interest when there exist clients of the SVG
> root that have relative lengths.
>
> BUG=603956
>
> Committed: https://crrev.com/30770a70834c73670884f0de91bb7624df0ba003
> Cr-Commit-Position: refs/heads/master@{#399791}

TBR=pdr@chromium.org,schenney@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=603956
Committed: https://crrev.com/7534b63d4979b824b1c3705d63a856028ff90fc5
Cr-Commit-Position: refs/heads/master@{#400411}

[fs, 2016-06-17 07:34:22]

The CQ bit was checked by fs@opera.com

[fs, 2016-06-17 07:34:22]

Created Revert of Remove redundant "layout size changed" state from
LayoutSVGRoot

[commit-bot: I haz the power, 2016-06-17 07:34:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2071953004/1

[commit-bot: I haz the power, 2016-06-17 10:09:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-17 10:11:46]

Description was changed from

==========
Revert of Remove redundant "layout size changed" state from LayoutSVGRoot
(patchset #1 id:1 of https://codereview.chromium.org/2065093002/ )

Reason for revert:
Possible cause of crbug.com/620228

Original issue's description:
> Remove redundant "layout size changed" state from LayoutSVGRoot
> 
> In LayoutSVGRoot::layout, two slightly different "layout size changed"
> values are computed - one which is used for propagation to children
> via SVGLayoutSupport::layoutSizeOfNearestViewportChanged
> (|m_isLayoutSizeChanged|), and one which is used to mark direct
> descendant children (local |layoutSizeChanged|).
> Ultimately their use is the same though, so only using the more narrow
> predicate for both of these cases should yield the same result.
> It also has the side-effect of making it more obvious that changes to
> layout-size is only of interest when there exist clients of the SVG
> root that have relative lengths.
> 
> BUG=603956
> 
> Committed: https://crrev.com/30770a70834c73670884f0de91bb7624df0ba003
> Cr-Commit-Position: refs/heads/master@{#399791}

TBR=pdr@chromium.org,schenney@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=603956
==========

to

==========
Revert of Remove redundant "layout size changed" state from LayoutSVGRoot
(patchset #1 id:1 of https://codereview.chromium.org/2065093002/ )

Reason for revert:
Possible cause of crbug.com/620228

Original issue's description:
> Remove redundant "layout size changed" state from LayoutSVGRoot
>
> In LayoutSVGRoot::layout, two slightly different "layout size changed"
> values are computed - one which is used for propagation to children
> via SVGLayoutSupport::layoutSizeOfNearestViewportChanged
> (|m_isLayoutSizeChanged|), and one which is used to mark direct
> descendant children (local |layoutSizeChanged|).
> Ultimately their use is the same though, so only using the more narrow
> predicate for both of these cases should yield the same result.
> It also has the side-effect of making it more obvious that changes to
> layout-size is only of interest when there exist clients of the SVG
> root that have relative lengths.
>
> BUG=603956
>
> Committed: https://crrev.com/30770a70834c73670884f0de91bb7624df0ba003
> Cr-Commit-Position: refs/heads/master@{#399791}

TBR=pdr@chromium.org,schenney@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=603956

Committed: https://crrev.com/7534b63d4979b824b1c3705d63a856028ff90fc5
Cr-Commit-Position: refs/heads/master@{#400411}
==========

[commit-bot: I haz the power, 2016-06-17 10:11:48]

Patchset 1 (id:??) landed as
https://crrev.com/7534b63d4979b824b1c3705d63a856028ff90fc5
Cr-Commit-Position: refs/heads/master@{#400411}