Serialize the font index.

src/core/SkFontDescriptor.h

Index: src/core/SkFontDescriptor.h
diff --git a/src/core/SkFontDescriptor.h b/src/core/SkFontDescriptor.h
index 5febfd81a3f36dd1af26154bd0672dd74c465f76..09bbfa3e156f9b5d085449b9e3275dcef6fba002 100644
--- a/src/core/SkFontDescriptor.h
+++ b/src/core/SkFontDescriptor.h
@@ -28,17 +28,20 @@ public:
     const char* getFullName() { return fFullName.c_str(); }
     const char* getPostscriptName() { return fPostscriptName.c_str(); }
     const char* getFontFileName() { return fFontFileName.c_str(); }
+    int getFontFileIndex() { return fFontFileIndex; }
 
     void setFamilyName(const char* name) { fFamilyName.set(name); }
     void setFullName(const char* name) { fFullName.set(name); }
     void setPostscriptName(const char* name) { fPostscriptName.set(name); }
     void setFontFileName(const char* name) { fFontFileName.set(name); }
+    void setFontFileIndex(int index) { fFontFileIndex = index; }
 
 private:
     SkString fFamilyName;
     SkString fFullName;
     SkString fPostscriptName;
     SkString fFontFileName;
+    int fFontFileIndex;
 
     SkTypeface::Style fStyle;
 };