pdfviewer: more load references dinamically plumming

experimental/PdfViewer/pdfparser/native/SkNativeParsedPDF.h

 #ifndef EXPERIMENTAL_PDFVIEWER_PDFPARSER_NATIVE_SKNATIVEPARSEDPDF_H_
 #define EXPERIMENTAL_PDFVIEWER_PDFPARSER_NATIVE_SKNATIVEPARSEDPDF_H_
 
 #include "SkRect.h"
 #include "SkTDArray.h"
 
 class SkCanvas;
 
 class SkPdfAllocator;
 class SkPdfMapper;
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     // TODO(edisonn): read methods: file, stream, http(s)://url, url with seek?
     // TODO(edisonn): read first page asap, linearized
     // TODO(edisonn): read page N asap, read all file
     // TODO(edisonn): allow corruptions of file (e.g. missing endobj, missing stream length, ...)
     // TODO(edisonn): encryption
     SkNativeParsedPDF(const char* path);
     ~SkNativeParsedPDF();
 
     int pages() const;
     SkPdfResourceDictionary* pageResources(int page);
-    SkRect MediaBox(int page) const;
-    SkPdfNativeTokenizer* tokenizerOfPage(int n) const;
+    SkRect MediaBox(int page);
+    SkPdfNativeTokenizer* tokenizerOfPage(int n);
 
-    SkPdfNativeTokenizer* tokenizerOfStream(SkPdfObject* stream) const;
-    SkPdfNativeTokenizer* tokenizerOfBuffer(unsigned char* buffer, size_t len) const;
+    SkPdfNativeTokenizer* tokenizerOfStream(SkPdfObject* stream);
+    SkPdfNativeTokenizer* tokenizerOfBuffer(unsigned char* buffer, size_t len);
 
     size_t objects() const;
     SkPdfObject* object(int i);
 
     const SkPdfMapper* mapper() const;
     SkPdfAllocator* allocator() const;
 
     SkPdfReal* createReal(double value) const;
     SkPdfInteger* createInteger(int value) const;
     // the string does not own the char*
     SkPdfString* createString(unsigned char* sz, size_t len) const;
 
     void drawPage(int page, SkCanvas* canvas);
 
-    SkPdfObject* resolveReference(SkPdfObject* ref) const;
-    SkPdfObject* resolveReference(const SkPdfObject* ref) const;
+    SkPdfObject* resolveReference(const SkPdfObject* ref);
 
 private:
 
     unsigned char* readCrossReferenceSection(unsigned char* xrefStart, unsigned char* trailerEnd);
     long readTrailer(unsigned char* trailerStart, unsigned char* trailerEnd, bool storeCatalog);
 
     // TODO(edisonn): updates not supported right now, generation ignored
     void addCrossSectionInfo(int id, int generation, int offset, bool isFreed);
     static void reset(PublicObjectEntry* obj) {
         obj->fObj = NULL;
         obj->fResolvedReference = NULL;
         obj->fOffset = -1;
     }
 
-    SkPdfObject* readObject(int id/*, int generation*/) const;
+    SkPdfObject* readObject(int id/*, int generation*/);
 
     void fillPages(SkPdfPageTreeNodeDictionary* tree);
 
     // private fields
     SkPdfAllocator* fAllocator;
     SkPdfMapper* fMapper;
     unsigned char* fFileContent;
     size_t fContentLength;
     const SkPdfObject* fRootCatalogRef;
     SkPdfCatalogDictionary* fRootCatalog;
 
     mutable SkTDArray<PublicObjectEntry> fObjects;
     SkTDArray<SkPdfPageObjectDictionary*> fPages;
 };
 
 #endif  // EXPERIMENTAL_PDFVIEWER_PDFPARSER_NATIVE_SKNATIVEPARSEDPDF_H_