Introduce LayoutBox::paginationBreakability().

third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 820 matching lines @@
         // We're at the very top of a page or column.
         if (lineBox != firstRootBox())
             lineBox.setIsFirstAfterPageBreak(true);
     }
 
     paginatedContentWasLaidOut(logicalOffset);
 }
 
 LayoutUnit LayoutBlockFlow::adjustForUnsplittableChild(LayoutBox& child, LayoutUnit logicalOffset)
 {
-    bool checkColumnBreaks = flowThreadContainingBlock();
-    bool checkPageBreaks = !checkColumnBreaks && view()->layoutState()->pageLogicalHeight();
-    bool isUnsplittable = child.isUnsplittableForPagination() || (checkColumnBreaks && child.style()->columnBreakInside() == PBAVOID)
-        || (checkPageBreaks && child.style()->pageBreakInside() == PBAVOID);
-    if (!isUnsplittable)
+    if (child.paginationBreakability() == AllowAnyBreaks)
         return logicalOffset;
     LayoutUnit childLogicalHeight = logicalHeightForChild(child);
     // Floats' margins do not collapse with page or column boundaries.
     if (child.isFloating())
         childLogicalHeight += marginBeforeForChild(child) + marginAfterForChild(child);
     LayoutUnit pageLogicalHeight = pageLogicalHeightForOffset(logicalOffset);
     updateMinimumPageHeight(logicalOffset, childLogicalHeight);
     if (!pageLogicalHeight)
         return logicalOffset;
     LayoutUnit remainingLogicalHeight = pageRemainingLogicalHeightForOffset(logicalOffset, AssociateWithLatterPage);
@@ skipping 2187 matching lines @@
     FrameView* frameView = document().view();
     LayoutUnit top = (style()->position() == FixedPosition) ? 0 : frameView->scrollOffset().height();
     int visibleHeight = frameView->visibleContentRect(IncludeScrollbars).height();
     if (size().height() < visibleHeight)
         top += (visibleHeight - size().height()) / 2;
     setY(top);
     dialog->setCentered(top);
 }
 
 } // namespace blink