Reviewed by Dave Hyatt.

        - fix https://bugs.webkit.org/show_bug.cgi?id=15384
          Div does not notice when grandparent changes height

        Test: fast/block/basic/quirk-percent-height-grandchild.html

        - fix https://bugs.webkit.org/show_bug.cgi?id=20714
          Resizing Gmail inbox vertically results in whitespace at the bottom of the window

        Test: fast/replaced/percent-height-in-anonymous-block.html

        Added a two-way mapping between boxes with percentage heights and
        their non-parent ancestors up to the one the height is computed relative
        to. In quirks mode (the first bug), this can be any number of containing
        block with auto height. In strict mode (the second bug) this can be
        the containing block of an anonymous block containing a replaced
        element.

        * rendering/RenderBlock.cpp:
        (WebCore::RenderBlock::~RenderBlock): Added code to remove the all the
        mapping to/from this block to percentage-height descendants.
        (WebCore::RenderBlock::layoutBlockChildren): Added code to mark
        percentage-height descendants (and their containing block ancestry chain
        up to this block) for layout. This ensures that those descendants whose
        height depends on the height of this block (or an ancestor) are updated.
        (WebCore::RenderBlock::addPercentHeightDescendant): Added. Establishes
        a two-way mapping between this block and the given box.
        (WebCore::RenderBlock::removePercentHeightDescendant): Added. Removes
        all the mapping to/from this box.
        * rendering/RenderBlock.h:
        * rendering/RenderBox.cpp:
        (WebCore::RenderBox::setStyle): Added calls to
        removePercentHeightDescendant() when style changes and the box
        previously had a percentage height. An exception is when the style
        change does not require layout, in which case the box still has
        a percentage height and the mappings are valid. In all other cases,
        any required mappings will be (re-)established during layout.
        (WebCore::RenderBox::destroy): Added a call to
        removePercentHeightDescendant.
        (WebCore::RenderBox::calcPercentageHeight): Added code that, in quirks
        mode, if a higher-than-parent containing block is affecting the box's
        height, creates a mapping between the box and that block.
        (WebCore::RenderBox::calcReplacedHeightUsing): Changed to skip over
        anonymous containing blocks, if any, and when that happens, use
        addPercentHeightDescendant() to ensure that the non-anonymous block
        is aware of the dependent percent-height box.

LayoutTests:

        Reviewed by Dave Hyatt.

        - test for https://bugs.webkit.org/show_bug.cgi?id=15384
          Div does not notice when grandparent changes height

        - test for https://bugs.webkit.org/show_bug.cgi?id=20714
          Resizing Gmail inbox vertically results in whitespace at the bottom of the window

        * fast/block/basic/quirk-percent-height-grandchild.html: Added.
        * fast/replaced/percent-height-in-anonymous-block.html: Added.
        * platform/mac/fast/block/basic/quirk-percent-height-grandchild-expected.checksum: Added.
        * platform/mac/fast/block/basic/quirk-percent-height-grandchild-expected.png: Added.
        * platform/mac/fast/block/basic/quirk-percent-height-grandchild-expected.txt: Added.
        * platform/mac/fast/replaced/percent-height-in-anonymous-block-expected.checksum: Added.
        * platform/mac/fast/replaced/percent-height-in-anonymous-block-expected.png: Added.
        * platform/mac/fast/replaced/percent-height-in-anonymous-block-expected.txt: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@36513 268f45cc-cd09-0410-ab3c-d52691b4dbfc