WebCore support for computing but not highlighting rects for text matches.

        * dom/Document.h:
        added setRenderedRectForMarker() and renderedRectsForMarkers(), and redefined
        MarkerMap to be a hashtable of node -> (pair of vectors), one vector of markers
        and one vector of rects
        
        * dom/Document.cpp:
        (placeholderRectForMarker()):
        new function, returns a recognizable degenerate rect used until a real rect has been set
        (WebCore::Document::addMarker):
        Reworked for new MarkerMap data structure; now adds parallel placeholder rect
        along with marker
        (WebCore::Document::copyMarkers):
        Reworked for new MarkerMap data structure
        (WebCore::Document::removeMarkers):
        Reworked for new MarkerMap data structure; now removed corresponding rect along
        with marker
        (WebCore::Document::markersForNode):
        Reworked for new MarkerMap data structure
        (WebCore::Document::renderedRectsForMarkers):
        New method, returns an array of all non-placeholder rects for the given marker type
        (WebCore::Document::repaintMarkers):
        Reworked for new MarkerMap data structure
        (WebCore::Document::setRenderedRectForMarker):
        New method, sets the rendered rect for a given marker
        (WebCore::Document::shiftMarkers):
        Reworked for new MarkerMap data structure; resets rendered rects to placeholders.
        
        * rendering/InlineTextBox.cpp:
        (WebCore::InlineTextBox::paint):
        removed markedTextMatchesAreHighlighted guard; we always want to call paintTextMatchMarker
        now, but sometimes we will end up only computing the rect, not actually highlighting it.
        (Maybe some names should be improved here?)
        (WebCore::InlineTextBox::paintTextMatchMarker):
        Reorganized to move all the code that actually draws into a block that's guarded by
        markedTextMatchesAreHighlighted. The rest of the code computes where the highlight will
        go, and now we always use that computation in order to call setRenderedRectForMarker.

        * bridge/mac/WebCoreFrameBridge.h:
        * bridge/mac/WebCoreFrameBridge.mm:
        (-[WebCoreFrameBridge rectsForTextMatches]):
        New method, returns an array of NSValues representing NSRects. Gets them
        from Document::renderedRectsForMarkers



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@14805 268f45cc-cd09-0410-ab3c-d52691b4dbfc