Allow fractional letter- word-spacing values.

Source/core/platform/graphics/Font.h

Index: Source/core/platform/graphics/Font.h
diff --git a/Source/core/platform/graphics/Font.h b/Source/core/platform/graphics/Font.h
index 1261b64e868999b625ea40319b9cbc64ae65ad82..0d990bf245f2148170bd49b5b652c94277ec96b2 100644
--- a/Source/core/platform/graphics/Font.h
+++ b/Source/core/platform/graphics/Font.h
@@ -79,7 +79,7 @@ struct GlyphOverflow {
 class Font {
 public:
     Font();
-    Font(const FontDescription&, short letterSpacing, short wordSpacing);
+    Font(const FontDescription&, float letterSpacing, float wordSpacing);
     // This constructor is only used if the platform wants to start with a native font.
     Font(const FontPlatformData&, bool isPrinting, FontSmoothingMode = AutoSmoothing);
     ~Font();
@@ -113,10 +113,10 @@ public:
 
     bool isSmallCaps() const { return m_fontDescription.smallCaps(); }
 
-    short wordSpacing() const { return m_wordSpacing; }
-    short letterSpacing() const { return m_letterSpacing; }
-    void setWordSpacing(short s) { m_wordSpacing = s; }
-    void setLetterSpacing(short s) { m_letterSpacing = s; }
+    float wordSpacing() const { return m_wordSpacing; }
+    float letterSpacing() const { return m_letterSpacing; }
+    void setWordSpacing(float s) { m_wordSpacing = s; }
+    void setLetterSpacing(float s) { m_letterSpacing = s; }
     bool isFixedPitch() const;
     bool isPrinterFont() const { return m_fontDescription.usePrinterFont(); }
     
@@ -289,8 +289,8 @@ private:
 
     FontDescription m_fontDescription;
     mutable RefPtr<FontFallbackList> m_fontFallbackList;
-    short m_letterSpacing;
-    short m_wordSpacing;
+    float m_letterSpacing;
+    float m_wordSpacing;
     bool m_isPlatformFont;
     bool m_needsTranscoding;
     mutable TypesettingFeatures m_typesettingFeatures; // Caches values computed from m_fontDescription.