More explicit LayoutUnit conversions

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

 /*
  * Copyright (C) 2011 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 1398 matching lines @@
 
         ++seenInFlowPositionedChildren;
         if (seenInFlowPositionedChildren < numberOfChildrenForJustifyContent)
             mainAxisOffset -= justifyContentSpaceBetweenChildren(availableFreeSpace, style()->justifyContentDistribution(), numberOfChildrenForJustifyContent);
     }
 }
 
 static LayoutUnit initialAlignContentOffset(LayoutUnit availableFreeSpace, ContentPosition alignContent, ContentDistributionType alignContentDistribution, unsigned numberOfLines)
 {
     if (numberOfLines <= 1)
-        return 0;
+        return LayoutUnit();
     if (alignContent == ContentPositionFlexEnd)
         return availableFreeSpace;
     if (alignContent == ContentPositionCenter)
         return availableFreeSpace / 2;
     if (alignContentDistribution == ContentDistributionSpaceAround) {
         if (availableFreeSpace > 0 && numberOfLines)
             return availableFreeSpace / (2 * numberOfLines);
         if (availableFreeSpace < 0)
             return availableFreeSpace / 2;
     }
-    return 0;
+    return LayoutUnit();
 }
 
 static LayoutUnit alignContentSpaceBetweenChildren(LayoutUnit availableFreeSpace, ContentDistributionType alignContentDistribution, unsigned numberOfLines)
 {
     if (availableFreeSpace > 0 && numberOfLines > 1) {
         if (alignContentDistribution == ContentDistributionSpaceBetween)
             return availableFreeSpace / (numberOfLines - 1);
         if (alignContentDistribution == ContentDistributionSpaceAround || alignContentDistribution == ContentDistributionStretch)
             return availableFreeSpace / numberOfLines;
     }
-    return 0;
+    return LayoutUnit();
 }
 
 void LayoutFlexibleBox::alignFlexLines(Vector<LineContext>& lineContexts)
 {
     // If we have a single line flexbox or a multiline line flexbox with only one flex line,
     // the line height is all the available space.
     // For flex-direction: row, this means we need to use the height, so we do this after calling updateLogicalHeight.
     if (lineContexts.size() == 1) {
         lineContexts[0].crossAxisExtent = crossAxisContentExtent();
         return;
@@ skipping 177 matching lines @@
             ASSERT(child);
             LayoutUnit lineCrossAxisExtent = lineContexts[lineNumber].crossAxisExtent;
             LayoutUnit originalOffset = lineContexts[lineNumber].crossAxisOffset - crossAxisStartEdge;
             LayoutUnit newOffset = contentExtent - originalOffset - lineCrossAxisExtent;
             adjustAlignmentForChild(*child, newOffset - originalOffset);
         }
     }
 }
 
 } // namespace blink