Merge 138111

Merge 138111
> Text Autosizing: containers wider than their enclosing clusters should be autosized as separate clusters
> https://bugs.webkit.org/show_bug.cgi?id=103627
> 
> Patch by Anton Vayvod <avayvod@chromium.org>; on 2012-12-18
> Reviewed by Julien Chaffraix.
> 
> Source/WebCore:
> 
> Some blocks of texts might be wider than their parent clusters and need to be autosized separately.
> 
> isAutosizingCluster() now checks for the width of the container being greater than the width of the lowest
> common ancestor of the text nodes of the enclosing cluster. This block containing all text is passed to all
> tree traversal methods.
> An overloaded version is added for cases when we don't have the lowest common ancestor yet.
> 
> The change fixes several cases covered by existing tests.
> 
> * rendering/TextAutosizer.cpp:
> (WebCore::TextAutosizer::processSubtree):
> 
>     Calls processCluster with a new number of arguments.
> 
> (WebCore::TextAutosizer::processCluster):
> 
>     Passes block containing all text nodes into processContainer. Assertion removed since it can no longer be
>     checked without passing an additional parameter (the parent block containing all text) to the function
>     for the sake of this assertion only.
> 
> (WebCore::TextAutosizer::processContainer):
> 
>     |parentBlockContainingAllText| parameter passed into isAutosizingCluster.
> 
> (WebCore::TextAutosizer::isAutosizingCluster(const RenderBlock*, const RenderBlock*)):
> 
>     The overloaded method that is used when the render block checked is already known to be an autosizing
>     container and there's full information necessary to determine if it's a cluster like the parent block
>     containing all text within the enclosing cluster.
>     Considers a block a cluster if it is wider than its parent block containing all text within enclosing
>     cluster.
> 
> (WebCore::TextAutosizer::isAutosizingCluster(const RenderObject*)):
> 
>     The overloaded method that checks for the given object to be an autosizing container first (for
>     convenience of the caller) and doesn't require information about the parent cluster. Used when such
>     information is not available, for example, in the process of retrieving the information for the parent
>     cluster or when looking for the root cluster in the tree.
> 
> (WebCore::TextAutosizer::clusterShouldBeAutosized):
> 
>     Passes new parameter to measureDescendantTextWidth.
> 
> (WebCore::TextAutosizer::measureDescendantTextWidth):
> 
>     Uses blockContainingAllText parameter to pass to isAutosizingCluster.
> 
> (WebCore::TextAutosizer::findDeepestBlockContainingAllText):
> 
>     Assertion removed since it can no longer be checked without passing an additional parameter (the
>     parent block containing all text) to the function for the sake of this assertion only.
> 
> (WebCore::TextAutosizer::findFirstTextLeafNotInCluster):
>     Uses shorter isAutosizingCluster call.
> 
> LayoutTests:
> 
> Modified existing tests to reflect the new autosizing approach to handling of the elements that are
> wider than the lowest common ancestor of the text nodes of the enclosing autosizing cluster.
> 
> * fast/text-autosizing/cluster-wide-in-narrow-expected.html:
> * fast/text-autosizing/cluster-wide-in-narrow.html:
> * fast/text-autosizing/wide-child-expected.html:
> * fast/text-autosizing/wide-child.html:
> * fast/text-autosizing/wide-in-narrow-overflow-scroll-expected.html:
> * fast/text-autosizing/wide-in-narrow-overflow-scroll.html:

TBR=commit-queue@webkit.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=139473