pdfviewer: add --pages arg: render a certain page (all, all in desceding order, firsl, last and by page number)

Review URL: https://codereview.chromium.org/18584010

git-svn-id: http://skia.googlecode.com/svn/trunk@9999 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/experimental/PdfViewer/SkPdfRenderer.h b/experimental/PdfViewer/SkPdfRenderer.h
index ba556ff..d6d2c92 100644
--- a/experimental/PdfViewer/SkPdfRenderer.h
+++ b/experimental/PdfViewer/SkPdfRenderer.h
@@ -34,6 +34,7 @@
     int pages() const;
     void unload();
     SkRect MediaBox(int page) const;
+    size_t bytesUsed() const;
 };
 
 void reportPdfRenderStats();