Rendering the property, text-align-last.

Source/core/rendering/RenderBlockLineLayout.cpp

 /*
  * 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.
  *
  * 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 690 matching lines @@
     // Now mark the line boxes as being constructed.
     lastLineBox()->setConstructed();
 
     // Return the last line.
     return lastRootBox();
 }
 
 ETextAlign RenderBlock::textAlignmentForLine(bool endsWithSoftBreak) const
 {
     ETextAlign alignment = style()->textAlign();
-    if (!endsWithSoftBreak && alignment == JUSTIFY)
-        alignment = TASTART;
+    if (endsWithSoftBreak)
+        return alignment;
+
+    if (!RuntimeEnabledFeatures::css3TextEnabled()) {
+        if (alignment == JUSTIFY)
+            alignment = TASTART;

[Julien - ping for review, 2013/10/22 15:06:06]

return TASTART;

This could even be written:

return (alignment == JUSTIFY) ? TASTART: alignment;

[dw.im, 2013/10/23 02:40:58]

Oh, it could be. 

+        return alignment;
+    }
+
+    TextAlignLast alignmentLast = style()->textAlignLast();
+    switch (alignmentLast) {
+    case TextAlignLastStart:
+        return TASTART;
+    case TextAlignLastEnd:
+        return TAEND;
+    case TextAlignLastLeft:
+        return LEFT;
+    case TextAlignLastRight:
+        return RIGHT;
+    case TextAlignLastCenter:
+        return CENTER;
+    case TextAlignLastJustify:
+        return JUSTIFY;
+    case TextAlignLastAuto:
+        if (alignment != JUSTIFY)
+            return alignment;
+        if (style()->textJustify() == TextJustifyDistribute)
+            return JUSTIFY;
+        return TASTART;
+    }
 
     return alignment;
 }
 
 static void updateLogicalWidthForLeftAlignedBlock(bool isLeftToRightDirection, BidiRun* trailingSpaceRun, float& logicalLeft, float& totalLogicalWidth, float availableLogicalWidth)
 {
     // The direction of the block should determine what happens with wide lines.
     // In particular with RTL blocks, wide lines should still spill out to the left.
     if (isLeftToRightDirection) {
         if (totalLogicalWidth > availableLogicalWidth && trailingSpaceRun)
@@ skipping 2825 matching lines @@
     lineGridBox->alignBoxesInBlockDirection(logicalHeight(), textBoxDataMap, verticalPositionCache);
 
     setLineGridBox(lineGridBox);
 
     // FIXME: If any of the characteristics of the box change compared to the old one, then we need to do a deep dirtying
     // (similar to what happens when the page height changes). Ideally, though, we only do this if someone is actually snapping
     // to this grid.
 }
 
 }