Fix Japanese line breaking rule before and after ruby

Source/core/layout/line/BreakingContextInlineHeaders.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All right reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2013 Adobe Systems Incorporated.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 439 matching lines @@
     m_width.addUncommittedWidth((inlineLogicalWidth(m_current.object()) + borderPaddingMarginStart(flowBox) + borderPaddingMarginEnd(flowBox)).toFloat());
 }
 
 inline void BreakingContext::handleReplaced()
 {
     LineLayoutBox replacedBox(m_current.object());
 
     if (m_atStart)
         m_width.updateAvailableWidth(replacedBox.logicalHeight());
 
-    // Break on replaced elements if either has normal white-space.
-    if ((m_autoWrap || ComputedStyle::autoWrap(m_lastWS)) && (!m_current.object().isImage() || m_allowImagesToBreak)) {
+    // Break on replaced elements if either has normal white-space,
+    // or if the replaced element is ruby that can break before.
+    if ((m_autoWrap || ComputedStyle::autoWrap(m_lastWS)) && (!m_current.object().isImage() || m_allowImagesToBreak)
+        && (!m_current.object().isRubyRun() || toLayoutRubyRun(m_current.object())->canBreakBefore(m_layoutTextInfo.m_lineBreakIterator))) {
         m_width.commit();
         m_lineBreak.moveToStartOf(m_current.object());
     }
 
     if (m_ignoringSpaces)
         m_lineMidpointState.stopIgnoringSpaces(InlineIterator(0, m_current.object(), 0));
 
     m_lineInfo.setEmpty(false, m_block, &m_width);
     m_ignoringSpaces = false;
     m_currentCharacterShouldCollapseIfPreWap = m_currentCharacterIsSpace = false;
@@ skipping 413 matching lines @@
             return;
         }
     } else if (m_blockStyle->autoWrap() && !m_width.fitsOnLine() && !m_width.committedWidth()) {
         // If the container autowraps but the current child does not then we still need to ensure that it
         // wraps and moves below any floats.
         m_width.fitBelowFloats(m_lineInfo.isFirstLine());
     }
 
     if (!m_current.object().isFloatingOrOutOfFlowPositioned()) {
         m_lastObject = m_current.object();
-        if (m_lastObject.isReplaced() && m_autoWrap && (!m_lastObject.isImage() || m_allowImagesToBreak) && (!m_lastObject.isListMarker() || LineLayoutListMarker(m_lastObject).isInside())) {
+        if (m_lastObject.isReplaced() && m_autoWrap && (!m_lastObject.isImage() || m_allowImagesToBreak) && (!m_lastObject.isListMarker() || LineLayoutListMarker(m_lastObject).isInside())
+            && !m_lastObject.isRubyRun()) {
             m_width.commit();
             m_lineBreak.moveToStartOf(m_nextObject);
         }
     }
 }
 
 inline IndentTextOrNot requiresIndent(bool isFirstLine, bool isAfterHardLineBreak, const ComputedStyle& style)
 {
     IndentTextOrNot shouldIndentText = DoNotIndentText;
     if (isFirstLine || (isAfterHardLineBreak && style.textIndentLine()) == TextIndentEachLine)
         shouldIndentText = IndentText;
 
     if (style.textIndentType() == TextIndentHanging)
         shouldIndentText = shouldIndentText == IndentText ? DoNotIndentText : IndentText;
 
     return shouldIndentText;
 }
 
 }
 
 #endif // BreakingContextInlineHeaders_h