Rendering text-justify:distribute for 8 bit characters.

Source/platform/graphics/TextRun.h

Index: Source/platform/graphics/TextRun.h
diff --git a/Source/platform/graphics/TextRun.h b/Source/platform/graphics/TextRun.h
index 81657d3b12a370d2e24657a3e2bc5bcf73d9f91c..d93e72347c3ca315a84fcd1a0b80ed780c60a064 100644
--- a/Source/platform/graphics/TextRun.h
+++ b/Source/platform/graphics/TextRun.h
@@ -196,6 +196,8 @@ public:
     float xPos() const { return m_xpos; }
     void setXPos(float xPos) { m_xpos = xPos; }
     float expansion() const { return m_expansion; }
+    bool isDistributeJustification() const { return m_distributeJustification; }
+    void setDistributeJustification(bool distributeJustification) { m_distributeJustification = distributeJustification; }
     bool allowsLeadingExpansion() const { return m_expansionBehavior & AllowLeadingExpansion; }
     bool allowsTrailingExpansion() const { return m_expansionBehavior & AllowTrailingExpansion; }
     TextDirection direction() const { return static_cast<TextDirection>(m_direction); }
@@ -245,6 +247,7 @@ private:
     float m_horizontalGlyphStretch;
 
     float m_expansion;
+    bool m_distributeJustification : 1;
     ExpansionBehavior m_expansionBehavior : 2;
     unsigned m_is8Bit : 1;
     unsigned m_allowTabs : 1;