https://bugs.webkit.org/show_bug.cgi?id=109100

Reviewed by Ojan Vafai.

Source/WebCore:

Test: fast/css-grid-layout/grid-item-removal-track-breadth-update.html

The test uncovered several bugs in our implementation that is fixed as part
of this change. They will be detailed below.

* rendering/RenderGrid.cpp:
(WebCore::RenderGrid::logicalContentHeightForChild):
Added this function to share the code between minContentForChild and maxContentForChild.
Also forced a relayout in this case to avoid getting a wrong answer (e.g. the logical height
constrained by the previous layout's grid breadth).

(WebCore::RenderGrid::minContentForChild):
(WebCore::RenderGrid::maxContentForChild):
Updated to use logicalContentHeightForChild.

(WebCore::RenderGrid::resolveContentBasedTrackSizingFunctions):
Updated to match the specification and set max breadth to current breadth per the specification.
This made us over-grow some cases in the test.

(WebCore::RenderGrid::distributeSpaceToTracks):
Updated to match the specification and use an extra variable to do the intermediate spreading. Also removed
a now unneeded max. This fixes the case of multiple grid items in the same grid area that was completely broken.

(WebCore::RenderGrid::layoutGridItems):
Added a FIXME about always relaying out content sized tracks' children.

* rendering/RenderGrid.h:
Added logicalContentHeightForChild.

LayoutTests:

* fast/css-grid-layout/grid-item-addition-track-breadth-update-expected.txt: Added.
* fast/css-grid-layout/grid-item-addition-track-breadth-update.html: Added.
* fast/css-grid-layout/grid-item-removal-track-breadth-update-expected.txt: Added.
* fast/css-grid-layout/grid-item-removal-track-breadth-update.html: Added.
New tests.

* fast/css-grid-layout/resources/grid.css:
(.constrainedContainer):
(.unconstrainedContainer):
Added these class to share them with other tests.

* fast/css-grid-layout/auto-content-resolution-columns.html:
* fast/css-grid-layout/auto-content-resolution-rows.html:
* fast/css-grid-layout/implicit-columns-auto-resolution.html:
* fast/css-grid-layout/implicit-position-dynamic-change.html:
* fast/css-grid-layout/implicit-rows-auto-resolution.html:
* fast/css-grid-layout/minmax-max-content-resolution-columns.html:
* fast/css-grid-layout/minmax-max-content-resolution-rows.html:
* fast/css-grid-layout/minmax-min-content-column-resolution-columns.html:
* fast/css-grid-layout/minmax-min-content-column-resolution-rows.html:
Removed constrainedContainer definition as it was moved to grid.css.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@142798 268f45cc-cd09-0410-ab3c-d52691b4dbfc