pdfviewer: remove dependency on picture_utils. add utility function to render SkStream into bitmap.

experimental/PdfViewer/pdfparser/native/SkNativeParsedPDF.h

Index: experimental/PdfViewer/pdfparser/native/SkNativeParsedPDF.h
===================================================================
--- experimental/PdfViewer/pdfparser/native/SkNativeParsedPDF.h	(revision 10286)
+++ experimental/PdfViewer/pdfparser/native/SkNativeParsedPDF.h	(working copy)
@@ -19,6 +19,8 @@
 
 class SkPdfNativeTokenizer;
 
+class SkStream;
+
 class SkNativeParsedPDF {
 private:
     struct PublicObjectEntry {
@@ -35,7 +37,10 @@
     // 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(SkStream* stream);
+
     ~SkNativeParsedPDF();
 
     int pages() const;
@@ -65,6 +70,9 @@
 
 private:
 
+    // Takes ownership of bytes.
+    void init(const void* bytes, size_t length);
+
     const unsigned char* readCrossReferenceSection(const unsigned char* xrefStart, const unsigned char* trailerEnd);
     long readTrailer(const unsigned char* trailerStart, const unsigned char* trailerEnd, bool storeCatalog);