Destroy SkScanlineDecoder in the SkCodec subclass destructors

include/codec/SkCodec.h

Index: include/codec/SkCodec.h
diff --git a/include/codec/SkCodec.h b/include/codec/SkCodec.h
index 2e47a261f3924f2b018d988af56440f4310de2d3..ca3b65ce0e11afb043a11ef9a600cbcff81e657f 100644
--- a/include/codec/SkCodec.h
+++ b/include/codec/SkCodec.h
@@ -177,6 +177,15 @@ protected:
         return fStream.get();
     }
 
+    /*
+     *
+     * Get method for the scanline decoder

[reed1, 2015/06/29 21:21:49]

nit: lets have the comment be slightly more useful, or eliminate it.

e.g.

/* If the codec has a scanline decoder, return it (no ownership change occurs)
else return NULL.
   The returned decoder is only valid until ...
*/

[msarett, 2015/06/29 21:59:43]

Done.

+     *
+     */
+    SkScanlineDecoder* scanlineDecoder() {
+        return fScanlineDecoder.get();
+    }
+
 private:
     SkAutoTDelete<SkStream>             fStream;
     bool                                fNeedsRewind;