change SkStreams to work with sk_sp<SkData> instead of SkData*

tools/debugger/SkDrawCommand.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDrawCommand.h"
 
 #include "SkBlurMaskFilter.h"
@@ skipping 689 matching lines @@
         return false;
     }
 
     SkBitmap bm;
     bm.installPixels(dstInfo, buffer.get(), rowBytes);
     sk_sp<SkData> encodedBitmap = sk_tools::encode_bitmap_for_png(bm);
 
     SkDynamicMemoryWStream out;
     SkDrawCommand::WritePNG((const png_bytep) encodedBitmap->bytes(), image.width(), image.height(),
                             out, false);
-    SkData* encoded = out.copyToData();
+    sk_sp<SkData> encoded = out.detachAsData();
     Json::Value jsonData;
     encode_data(encoded->data(), encoded->size(), "image/png", urlDataManager, &jsonData);
     (*target)[SKDEBUGCANVAS_ATTRIBUTE_DATA] = jsonData;
-    encoded->unref();
     return true;
 }
 
 static const char* color_type_name(SkColorType colorType) {
     switch (colorType) {
         case kARGB_4444_SkColorType:
             return SKDEBUGCANVAS_COLORTYPE_ARGB4444;
         case kRGBA_8888_SkColorType:
             return SKDEBUGCANVAS_COLORTYPE_RGBA8888;
         case kBGRA_8888_SkColorType:
@@ skipping 2823 matching lines @@
 SkTranslateZCommand* SkTranslateZCommand::fromJSON(Json::Value& command,
                                        UrlDataManager& urlDataManager) {
     SkScalar z;
 #ifdef SK_EXPERIMENTAL_SHADOWING
     extract_json_scalar(command[SKDEBUGCANVAS_ATTRIBUTE_DRAWDEPTHTRANS], &z);
 #else
     z = 0;
 #endif
     return new SkTranslateZCommand(z);
 }