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

experimental/PdfViewer/SkPdfUtils.cpp

Index: experimental/PdfViewer/SkPdfUtils.cpp
===================================================================
--- experimental/PdfViewer/SkPdfUtils.cpp	(revision 9812)
+++ experimental/PdfViewer/SkPdfUtils.cpp	(working copy)
@@ -1,37 +1,2 @@
 #include "SkPdfUtils.h"
 
-bool ArrayFromDictionary(const PdfMemDocument* pdfDoc,
-                         const PdfDictionary& dict,
-                         const char* key,
-                         const char* abr,
-                         SkPdfArray* data) {return false;}
-
-bool FileSpecFromDictionary(const PdfMemDocument* pdfDoc,
-                         const PdfDictionary& dict,
-                         const char* key,
-                         const char* abr,
-                         SkPdfFileSpec* data) {return false;}
-
-bool StreamFromDictionary(const PdfMemDocument* pdfDoc,
-                         const PdfDictionary& dict,
-                         const char* key,
-                         const char* abr,
-                         SkPdfStream** data);
-
-bool TreeFromDictionary(const PdfMemDocument* pdfDoc,
-                         const PdfDictionary& dict,
-                         const char* key,
-                         const char* abr,
-                         SkPdfTree** data) {return false;}
-
-bool DateFromDictionary(const PdfMemDocument* pdfDoc,
-                         const PdfDictionary& dict,
-                         const char* key,
-                         const char* abr,
-                         SkPdfDate* data) {return false;}
-
-bool FunctionFromDictionary(const PdfMemDocument* pdfDoc,
-                         const PdfDictionary& dict,
-                         const char* key,
-                         const char* abr,
-                         SkPdfFunction* data) {return false;}