Allow fractional letter- word-spacing values.

Source/core/rendering/style/RenderStyle.h

Index: Source/core/rendering/style/RenderStyle.h
diff --git a/Source/core/rendering/style/RenderStyle.h b/Source/core/rendering/style/RenderStyle.h
index c31dfcf0dbf59643dff48a34b09619f0c5176943..bb43d6ef15a5510ad3baea9c0c9cc6e240a5e87b 100644
--- a/Source/core/rendering/style/RenderStyle.h
+++ b/Source/core/rendering/style/RenderStyle.h
@@ -549,8 +549,8 @@ public:
     TextUnderlinePosition textUnderlinePosition() const { return static_cast<TextUnderlinePosition>(rareInheritedData->m_textUnderlinePosition); }
 #endif // CSS3_TEXT
     TextDecorationStyle textDecorationStyle() const { return static_cast<TextDecorationStyle>(rareNonInheritedData->m_textDecorationStyle); }
-    int wordSpacing() const;
-    int letterSpacing() const;
+    float wordSpacing() const;
+    float letterSpacing() const;
 
     float zoom() const { return visual->m_zoom; }
     float effectiveZoom() const { return rareInheritedData->m_effectiveZoom; }
@@ -1068,8 +1068,8 @@ public:
 
     void setWhiteSpace(EWhiteSpace v) { inherited_flags._white_space = v; }
 
-    void setWordSpacing(int);
-    void setLetterSpacing(int);
+    void setWordSpacing(float);
+    void setLetterSpacing(float);
 
     void clearBackgroundLayers() { m_background.access()->m_background = FillLayer(BackgroundFillLayer); }
     void inheritBackgroundLayers(const FillLayer& parent) { m_background.access()->m_background = parent; }
@@ -1488,7 +1488,7 @@ public:
     static unsigned initialBorderWidth() { return 3; }
     static unsigned short initialColumnRuleWidth() { return 3; }
     static unsigned short initialOutlineWidth() { return 3; }
-    static int initialLetterWordSpacing() { return 0; }
+    static float initialLetterWordSpacing() { return 0.0f; }
     static Length initialSize() { return Length(); }
     static Length initialMinSize() { return Length(Fixed); }
     static Length initialMaxSize() { return Length(Undefined); }