Rendering text-justify:distribute for 8 bit characters.

Source/platform/fonts/Character.cpp

Index: Source/platform/fonts/Character.cpp
diff --git a/Source/platform/fonts/Character.cpp b/Source/platform/fonts/Character.cpp
index 40ccd3ee22fecd4196832e4db6ffed5b7cd1903f..8848ba04d59d3716704a3f65c5cbbabe0dee3f1a 100644
--- a/Source/platform/fonts/Character.cpp
+++ b/Source/platform/fonts/Character.cpp
@@ -272,32 +272,32 @@ bool Character::isCJKIdeographOrSymbol(UChar32 c)
     return valueInIntervalList(cjkSymbolRanges, c);
 }
 
-unsigned Character::expansionOpportunityCount(const LChar* characters, size_t length, TextDirection direction, bool& isAfterExpansion)
+unsigned Character::expansionOpportunityCount(const LChar* characters, size_t length, TextDirection direction, bool& isAfterExpansion, const bool distributeJustification)
 {
     unsigned count = 0;
     if (direction == LTR) {
         for (size_t i = 0; i < length; ++i) {
-            if (treatAsSpace(characters[i])) {
+            if (treatAsSpace(characters[i]) || distributeJustification)
                 count++;
-                isAfterExpansion = true;
-            } else {
-                isAfterExpansion = false;
-            }
         }
+        if (treatAsSpace(characters[length - 1]))
+            isAfterExpansion = true;
+        else
+            isAfterExpansion = false;
     } else {
         for (size_t i = length; i > 0; --i) {
-            if (treatAsSpace(characters[i - 1])) {
+            if (treatAsSpace(characters[i - 1]) || distributeJustification)
                 count++;
-                isAfterExpansion = true;
-            } else {
-                isAfterExpansion = false;
-            }
         }
+        if (treatAsSpace(characters[0]))
+            isAfterExpansion = true;
+        else
+            isAfterExpansion = false;
     }
     return count;
 }
 
-unsigned Character::expansionOpportunityCount(const UChar* characters, size_t length, TextDirection direction, bool& isAfterExpansion)
+unsigned Character::expansionOpportunityCount(const UChar* characters, size_t length, TextDirection direction, bool& isAfterExpansion, const bool distributeJustification)
 {
     static bool expandAroundIdeographs = FontPlatformFeatures::canExpandAroundIdeographsInComplexText();
     unsigned count = 0;