SkPDF: Move utility fns to SkPDFUtils

src/pdf/SkPDFTypes.h

Index: src/pdf/SkPDFTypes.h
diff --git a/src/pdf/SkPDFTypes.h b/src/pdf/SkPDFTypes.h
index ff269b3bfd5d46dd31474fb852d19a05cfc14e06..35922f81eb1ba60dd7bb70a18acf6177731bfbcc 100644
--- a/src/pdf/SkPDFTypes.h
+++ b/src/pdf/SkPDFTypes.h
@@ -180,17 +180,7 @@ private:
 };
 #endif  // 0
 
-class SkPDFScalar {
-public:
-    static void Append(SkScalar value, SkWStream* stream);
-};
-
-class SkPDFString {
-public:
-    static SkString FormatString(const char* input, size_t len);
-    static const size_t kMaxLen = 65535;
-};
-
+////////////////////////////////////////////////////////////////////////////////
 
 /** \class SkPDFArray