Fix encoded paragraph size

sky/engine/core/dart/text.dart

@@ -368,7 +368,7 @@ Int32List _encodeParagraphStyle(TextAlign textAlign,
                                 String fontFamily,
                                 double fontSize,
                                 double lineHeight) {
-  Int32List result = new Int32List(3);
+  Int32List result = new Int32List(5);
   if (textAlign != null) {
     result[0] |= 1 << 1;
     result[1] = textAlign.index;

sky/engine/core/text/ParagraphBuilder.cpp

@@ -233,7 +233,7 @@ void ParagraphBuilder::addText(const std::string& text)
 
 PassRefPtr<Paragraph> ParagraphBuilder::build(Int32List& encoded, const std::string& fontFamily, double fontSize, double lineHeight)
 {
-    DCHECK(encoded.num_elements() == 3);
+    DCHECK(encoded.num_elements() == 5);
     int32_t mask = encoded[0];
 
     if (mask) {