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

experimental/PdfViewer/SkPdfRenderer.h

Index: experimental/PdfViewer/SkPdfRenderer.h
===================================================================
--- experimental/PdfViewer/SkPdfRenderer.h	(revision 10286)
+++ experimental/PdfViewer/SkPdfRenderer.h	(working copy)
@@ -9,10 +9,17 @@
 #ifndef SkPdfRenderer_DEFINED
 #define SkPdfRenderer_DEFINED
 
+class SkBitmap;
 class SkCanvas;
 class SkNativeParsedPDF;
 class SkRect;
+class SkStream;
 
+enum SkPdfContent {
+    kNoForms_SkPdfContent,
+    kAll_SkPdfContent,
+};
+
 // TODO(edisonn): move in another file
 class SkPdfRenderer : public SkRefCnt {
     SkNativeParsedPDF* fPdfDoc;
@@ -24,6 +31,7 @@
     bool renderPage(int page, SkCanvas* canvas, const SkRect& dst) const;
 
     bool load(const SkString inputFileName);
+    bool load(SkStream* stream);
     bool loaded() const {return fPdfDoc != NULL;}
     int pages() const;
     void unload();
@@ -33,4 +41,10 @@
 
 void reportPdfRenderStats();
 
+bool SkPDFNativeRenderToBitmap(SkStream* stream,
+                               SkBitmap* output,
+                               int page = 0,
+                               SkPdfContent content = kAll_SkPdfContent,
+                               double dpi = 72.0);
+
 #endif  // SkPdfRenderer_DEFINED