Add font support to PageSerializer

Source/core/css/CSSFontFaceRule.h

Index: Source/core/css/CSSFontFaceRule.h
diff --git a/Source/core/css/CSSFontFaceRule.h b/Source/core/css/CSSFontFaceRule.h
index a042e8fee4154280f5be72a23bb0bbaf894101af..25b7670cee1773c3bebb9325ae65ab6e8ccab6d7 100644
--- a/Source/core/css/CSSFontFaceRule.h
+++ b/Source/core/css/CSSFontFaceRule.h
@@ -42,6 +42,9 @@ public:
 
     CSSStyleDeclaration* style() const;
 
+    // TODO(tiger): Not CSSOM. Remove.

[abarth-chromium, 2013/08/19 19:30:04]

I would skip this comment.  If we don't want this function, we shouldn't include
it in this CL.

+    StyleRuleFontFace* styleRule() const { return m_fontFaceRule.get(); }
+
 private:
     CSSFontFaceRule(StyleRuleFontFace*, CSSStyleSheet* parent);