SkDocument::setDCTEncoder() for old versions of webkit

include/core/SkDocument.h

Index: include/core/SkDocument.h
diff --git a/include/core/SkDocument.h b/include/core/SkDocument.h
index 316d15a253429ea07c7b40e102a8e22f36e8e6d8..8a797ca6a5d0193d956bf30492d9601041bf4a94 100644
--- a/include/core/SkDocument.h
+++ b/include/core/SkDocument.h
@@ -16,6 +16,8 @@
 #include "SkTime.h"
 
 class SkCanvas;
+class SkData;
+class SkPixmap;
 class SkWStream;
 
 /** SK_ScalarDefaultDPI is 72 DPI.
@@ -133,6 +135,21 @@ public:
                              const SkTime::DateTime* /* creationDate */,
                              const SkTime::DateTime* /* modifiedDate */) {}
 
+    /**
+     *  For PDF documents, if a DCTEncoder (discrete cosine transform)
+     *  is set, use it to encode SkImages and SkBitmaps as [JFIF]JPEGs.
+     *  This feature is deprecated and is only supplied for backwards
+     *  compatability.
+     *
+     *  The prefered method to create PDFs with JPEG images is to use
+     *  SkImage::NewFromEncoded() and not setDCTEncoder().  Chromium
+     *  uses NewFromEncoded.
+     *
+     *  If the encoder is unset, or if it returns NULL, fall back on
+     *  encoding images with Deflate.
+     */
+    virtual void setDCTEncoder(SkData* (*)(const SkPixmap&)) {}
+
 protected:
     SkDocument(SkWStream*, void (*)(SkWStream*, bool aborted));