Switch line layout to LayoutUnit.

Source/core/layout/LayoutRubyText.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple 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.
@@ skipping 42 matching lines @@
 {
     ETextAlign textAlign = style()->textAlign();
     // FIXME: This check is bogus since user can set the initial value.
     if (textAlign != ComputedStyle::initialTextAlign())
         return LayoutBlockFlow::textAlignmentForLine(endsWithSoftBreak);
 
     // The default behavior is to allow ruby text to expand if it is shorter than the ruby base.
     return JUSTIFY;
 }
 
-void LayoutRubyText::adjustInlineDirectionLineBounds(unsigned expansionOpportunityCount, float& logicalLeft, float& logicalWidth) const
+void LayoutRubyText::adjustInlineDirectionLineBounds(unsigned expansionOpportunityCount, LayoutUnit& logicalLeft, LayoutUnit& logicalWidth) const
 {
     ETextAlign textAlign = style()->textAlign();
     // FIXME: This check is bogus since user can set the initial value.
     if (textAlign != ComputedStyle::initialTextAlign())
         return LayoutBlockFlow::adjustInlineDirectionLineBounds(expansionOpportunityCount, logicalLeft, logicalWidth);
 
     int maxPreferredLogicalWidth = this->maxPreferredLogicalWidth();
     if (maxPreferredLogicalWidth >= logicalWidth)
         return;
 
     // Inset the ruby text by half the inter-ideograph expansion amount, but no more than a full-width
     // ruby character on each side.
-    float inset = (logicalWidth - maxPreferredLogicalWidth) / (expansionOpportunityCount + 1);
+    LayoutUnit inset = (logicalWidth - maxPreferredLogicalWidth) / (expansionOpportunityCount + 1);
     if (expansionOpportunityCount)
-        inset = std::min<float>(2 * style()->fontSize(), inset);
+        inset = std::min(LayoutUnit(2 * style()->fontSize()), inset);
 
     logicalLeft += inset / 2;
     logicalWidth -= inset;
 }
 
 bool LayoutRubyText::avoidsFloats() const
 {
     return true;
 }
 
 } // namespace blink