isolate podofo to prepare for native parser, autogenerate PDF API during build

experimental/PdfViewer/SkPdfFont.h

 #ifndef __DEFINED__SkPdfFont
 #define __DEFINED__SkPdfFont
 
 #include "SkPdfHeaders_autogen.h"
-#include "SkPdfPodofoMapper_autogen.h"
+#include "SkPdfMapper_autogen.h"
 
 #include <map>
 #include <string>
 
 #include "SkTypeface.h"
 #include "SkUtils.h"
 #include "SkPdfBasics.h"
 #include "SkPdfUtils.h"
 
 
@@ skipping 13 matching lines @@
 
 std::map<std::string, SkPdfStandardFontEntry>& getStandardFonts();
 SkTypeface* SkTypefaceFromPdfStandardFont(const char* fontName, bool bold, bool italic);
 SkPdfFont* fontFromName(SkPdfObject* obj, const char* fontName);
 
 struct SkUnencodedText {
     void* text;
     int len;
 
 public:
-    SkUnencodedText(const SkPdfObject* obj) {
-        text = (void*)obj->podofo()->GetString().GetString();
-        len = obj->podofo()->GetString().GetLength();
+    SkUnencodedText(const SkPdfString* obj) {
+        text = (void*)obj->c_str();
+        len = obj->len();
     }
 };
 
 struct SkDecodedText {
     uint16_t* text;
     int len;
 public:
     unsigned int operator[](int i) const { return text[i]; }
     int size() const { return len; }
 };
@@ skipping 343 matching lines @@
         pdfContext->fGraphicsState.fMatrixTm.preTranslate(SkDoubleToScalar(pdfContext->fGraphicsState.fCurFontSize * fChars[ch - fFirstChar].fWidth),
                              SkDoubleToScalar(0.0));
     }
 
     virtual void afterWord(SkPaint* paint, SkMatrix* matrix) {
 
     }
 };
 
 #endif  // __DEFINED__SkPdfFont