Use SkPicture's InstallPixelRefProc to decode SkImages in an skp

src/core/SkReadBuffer.h

Index: src/core/SkReadBuffer.h
diff --git a/src/core/SkReadBuffer.h b/src/core/SkReadBuffer.h
index 3d6dd362acccceb5e93c5f72d46eafbba4a24526..07bdf3eb52145a1ec395ac21557207c9d50b8d6c 100644
--- a/src/core/SkReadBuffer.h
+++ b/src/core/SkReadBuffer.h
@@ -224,6 +224,13 @@ protected:
 private:
     bool readArray(void* value, size_t size, size_t elementSize);
 
+    /**
+     *  Try to use fBitmapDecoder to decode the data.  Returns true on success and false
+     *  on failure.
+     */
+    bool decodeBitmap(const void* data, size_t length, SkBitmap* bitmap,
+            const SkIRect& subset);
+
     uint32_t fFlags;
     int fVersion;