SVG + <object> tests are flakey

SVG + <object> tests are flakey
https://bugs.webkit.org/show_bug.cgi?id=77099

Reviewed by Andreas Kling.

Source/WebCore:

Bug 76447 changed the way RenderSVGRoot figures out its size. Previously RenderSVGRoot directly called out to the
ownerRenderer (RenderEmbeddedObject) to compute its replaced size when embedded through eg. <object> element,
which was quite hacky. It now relies on the ownerRenderers availableLogicalWidth/Height to be correctly set,
which requires that the ownerRenderer is always laid out before the RenderSVGRoot and not the other way round.

This is the source of current flakiness bugs.

In trunk FrameView contains several special hacks, to layout the ownerRenderers view, after the RenderSVGRoots view
finished layout. This worked without flakiness as RenderSVGRoot used to directly call computeReplacedLogicalWidth/Height
on the ownerRenderer, which is now gone. Fortunately we can keep the new design, and can remove all hacks out of
RenderSVGRoot/FrameView, if we can guarantee that the ownerRenderer FrameView is laid out before the RenderSVGRoot FrameView.

This is a much less error-prone approach as the previous one. This lets us run nrwt --tolerance 0 -p svg -g again,
without 100% reproducable failing svg/wicd tests. (There's still one unrelated error, before guard malloc mode passes fully).

Test: svg/wicd/sizing-flakiness.html (Adjusted version of the rightsizing test, made to fail with trunk w/o this patch.)

* page/FrameView.cpp: Remove m_inLayoutParentView.
(WebCore::FrameView::FrameView): Remove no longer needed m_inLayoutParentView.
(WebCore::FrameView::forceLayoutParentViewIfNeeded): Simplify, no need to call updateWidgetPositions anymore, nor to clear/query flags in RenderSVGRoot.
(WebCore::FrameView::layout): Call forceLayoutParentViewIfNeeded() before laying out the embedded document, to guarantee the correct order.
* page/FrameView.h:
(FrameView): Remove m_inLayoutParentView.
* rendering/svg/RenderSVGRoot.cpp:
(WebCore::RenderSVGRoot::RenderSVGRoot): Remove m_needsSizeNegotiationWithHostDocument.
(WebCore::resolveLengthAttributeForSVG): Remove outcommented code, that went in by accident.
(WebCore::RenderSVGRoot::layout): Remove m_needsSizeNegotiationWithHostDocument handling which is now incorrect and no longer needed.
* rendering/svg/RenderSVGRoot.h:
(RenderSVGRoot): Remove m_needsSizeNegotiationWithHostDocument + accessors.

LayoutTests:

Introduce a testcase that fails reproducibly w/o needed guard malloc, if we ever regress <object> sizing again.

* platform/mac/svg/wicd/sizing-flakiness-expected.png:
* platform/mac/svg/wicd/sizing-flakiness-expected.txt:
* svg/wicd/sizing-flakiness.html: Adjusted version of the rightsizing test, made to fail with trunk w/o this patch.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@106001 268f45cc-cd09-0410-ab3c-d52691b4dbfc