JPEG(JFIF only) directly embedded into PDF

src/pdf/SkPDFImage.h

Index: src/pdf/SkPDFImage.h
diff --git a/src/pdf/SkPDFImage.h b/src/pdf/SkPDFImage.h
index 10f8be627077f7c6e7f84e220934a2db35e5eb60..5c026dac9ad961a54b08a325641155fa4ee99469 100644
--- a/src/pdf/SkPDFImage.h
+++ b/src/pdf/SkPDFImage.h
@@ -17,9 +17,20 @@
 #include "SkRefCnt.h"
 
 class SkBitmap;
+class SkData;
 class SkPDFCatalog;
 struct SkIRect;
 
+/**
+ *  Return the mose efficient availible encoding of the given bitmap.
+ *
+ *  If the bitmap has encoded JPEG data and that data can be embedded
+ *  into the PDF output stream directly, use that.  Otherwise, fall
+ *  back on SkPDFImage::CreateImage.
+ */
+SkPDFObject* SkPDFCreateImageObject(
+        const SkBitmap&, const SkIRect& subset, SkPicture::EncodeBitmap);
+
 /** \class SkPDFImage
 
     An image XObject.