Rendering text-justify:distribute for 8 bit characters.

Source/platform/text/TextRun.h

Index: Source/platform/text/TextRun.h
diff --git a/Source/platform/text/TextRun.h b/Source/platform/text/TextRun.h
index 81657d3b12a370d2e24657a3e2bc5bcf73d9f91c..3ceba79dd6be3cf8b72321b0816e5b4d25569f87 100644
--- a/Source/platform/text/TextRun.h
+++ b/Source/platform/text/TextRun.h
@@ -75,6 +75,7 @@ public:
         , m_applyRunRounding((roundingHacks & RunRounding) && s_allowsRoundingHacks)
         , m_applyWordRounding((roundingHacks & WordRounding) && s_allowsRoundingHacks)
         , m_disableSpacing(false)
+        , m_distributeJustification(false)
         , m_tabSize(0)
     {
         m_data.characters8 = c;
@@ -95,6 +96,7 @@ public:
         , m_applyRunRounding((roundingHacks & RunRounding) && s_allowsRoundingHacks)
         , m_applyWordRounding((roundingHacks & WordRounding) && s_allowsRoundingHacks)
         , m_disableSpacing(false)
+        , m_distributeJustification(false)
         , m_tabSize(0)
     {
         m_data.characters16 = c;
@@ -114,6 +116,7 @@ public:
         , m_applyRunRounding((roundingHacks & RunRounding) && s_allowsRoundingHacks)
         , m_applyWordRounding((roundingHacks & WordRounding) && s_allowsRoundingHacks)
         , m_disableSpacing(false)
+        , m_distributeJustification(false)
         , m_tabSize(0)
     {
         if (!m_charactersLength) {
@@ -142,6 +145,7 @@ public:
         , m_applyRunRounding((roundingHacks & RunRounding) && s_allowsRoundingHacks)
         , m_applyWordRounding((roundingHacks & WordRounding) && s_allowsRoundingHacks)
         , m_disableSpacing(false)
+        , m_distributeJustification(false)
         , m_tabSize(0)
     {
         if (!m_charactersLength) {
@@ -196,6 +200,8 @@ 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); }
@@ -254,6 +260,7 @@ private:
     unsigned m_applyRunRounding : 1;
     unsigned m_applyWordRounding : 1;
     unsigned m_disableSpacing : 1;
+    unsigned m_distributeJustification : 1;
     unsigned m_tabSize;
     RefPtr<RenderingContext> m_renderingContext;
 };