Make SkStream *not* ref counted.

dm/DMImageTask.cpp

 #include "DMImageTask.h"
 #include "DMUtil.h"
 #include "DMWriteTask.h"
 #include "SkImageDecoder.h"
 #include "SkRandom.h"
 
 #include <string.h>
 
 namespace DM {
 
@@ skipping 20 matching lines @@
     if (fSubsets == 0) {
         // Decoding the whole image is considerably simpler than decoding subsets!
         SkBitmap bitmap;
         if (!SkImageDecoder::DecodeMemory(fEncoded->data(), fEncoded->size(), &bitmap)) {
             return this->fail("Can't DecodeMemory");
         }
         this->spawnChild(SkNEW_ARGS(WriteTask, (*this, "image", bitmap)));
         return;
     }
 
-    SkMemoryStream stream(fEncoded->data(), fEncoded->size());
-    SkAutoTDelete<SkImageDecoder> decoder(SkImageDecoder::Factory(&stream));
+    SkAutoTDelete<SkMemoryStream> stream(SkNEW_ARGS(SkMemoryStream,
+                                                    (fEncoded->data(), fEncoded->size())));
+    SkAutoTDelete<SkImageDecoder> decoder(SkImageDecoder::Factory(stream));
     if (!decoder) {
         return this->fail("Can't find good decoder.");
     }
 
     int w,h;
-    if (!decoder->buildTileIndex(&stream, &w, &h) || w*h == 1) {
+    if (!decoder->buildTileIndex(stream.detach(), &w, &h) || w*h == 1) {
         return;  // Subset decoding is not always supported.
     }
 
     SkBitmap composite;
     composite.allocN32Pixels(w,h);  // We're lazy here and just always use native 8888.
     composite.eraseColor(SK_ColorTRANSPARENT);
     SkCanvas canvas(composite);
 
     SkRandom rand;
     for (int i = 0; i < fSubsets; i++) {
@@ skipping 10 matching lines @@
         if (!decoder->decodeSubset(&subset, rect, kN32_SkColorType)) {
             return this->fail("Could not decode subset.");
         }
         canvas.drawBitmap(subset, SkIntToScalar(rect.fLeft), SkIntToScalar(rect.fTop));
     }
     canvas.flush();
     this->spawnChild(SkNEW_ARGS(WriteTask, (*this, "image", composite)));
 }
 
 }  // namespace DM