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

experimental/PdfViewer/pdfparser/podofo/SkPodofoParsedPDF.h

+#ifndef EXPERIMENTAL_PDFVIEWER_PDFPARSER_PODOFO_SKPODOFOPARSEDPDF_H_
+#define EXPERIMENTAL_PDFVIEWER_PDFPARSER_PODOFO_SKPODOFOPARSEDPDF_H_
+
+#include "SkRect.h"
+
+class SkCanvas;
+
+class SkPdfInteger;
+class SkPdfMapper;
+class SkPdfNumber;
+class SkPdfObject;
+class SkPdfResourceDictionary;
+class SkPdfStream;
+class SkPdfString;
+
+class SkPdfPodofoTokenizer;
+
+namespace PoDoFo {
+class PdfMemDocument;
+class PdfObject;
+}
+
+class SkPodofoParsedPDF {
+public:
+    SkPodofoParsedPDF(const char* path);
+    virtual ~SkPodofoParsedPDF();
+
+    virtual int pages() const;
+    virtual double width(int page) const;
+    virtual double height(int page) const;
+    const SkPdfResourceDictionary* pageResources(int page) const;
+    virtual SkRect MediaBox(int n) const;
+    virtual SkPdfPodofoTokenizer* tokenizerOfPage(int n) const;
+
+    virtual SkPdfPodofoTokenizer* tokenizerOfStream(const SkPdfStream* stream) const;
+    virtual SkPdfPodofoTokenizer* tokenizerOfBuffer(char* buffer, size_t len) const;
+
+    virtual size_t objects() const;
+    virtual const SkPdfObject* object(int i) const;
+
+    PoDoFo::PdfMemDocument* podofo() const {return fDoc;}
+
+    const SkPdfMapper* mapper() const;
+
+    SkPdfNumber* createNumber(double number) const;
+    SkPdfInteger* createInteger(int value) const;
+    SkPdfString* createString(char* sz, size_t len) const;
+
+    void drawPage(int page, SkCanvas* canvas) const;
+
+private:
+    SkPdfObject* make(PoDoFo::PdfObject* obj) const;
+    const SkPdfObject* make(const PoDoFo::PdfObject* obj) const;
+
+    PoDoFo::PdfMemDocument* fDoc;
+    SkPdfMapper* fMapper;
+};
+
+#endif  // EXPERIMENTAL_PDFVIEWER_PDFPARSER_PODOFO_SKPODOFOPARSEDPDF_H_