use SkData oriented picture serialize api

blimp/engine/renderer/blimp_engine_picture_cache.cc

Index: blimp/engine/renderer/blimp_engine_picture_cache.cc
diff --git a/blimp/engine/renderer/blimp_engine_picture_cache.cc b/blimp/engine/renderer/blimp_engine_picture_cache.cc
index bb67345dca71558cfd387a4c98b5b97dc20c0399..0448d531217fa1f80965f58df651722b9ba87ecc 100644
--- a/blimp/engine/renderer/blimp_engine_picture_cache.cc
+++ b/blimp/engine/renderer/blimp_engine_picture_cache.cc
@@ -52,15 +52,13 @@ BlimpEnginePictureCache::CalculateCacheUpdateAndFlush() {
 }
 
 void BlimpEnginePictureCache::Put(const SkPicture* picture) {
-  SkDynamicMemoryWStream stream;
-  picture->serialize(&stream, pixel_serializer_);
-  DCHECK_GE(stream.bytesWritten(), 0u);
+  sk_sp<SkData> data = picture->serialize(pixel_serializer_);
+  DCHECK_GE(data->size(), 0u);
 
   // Store the picture data until it is sent to the client.
   pictures_.insert(
       std::make_pair(picture->uniqueID(),
-                     cc::PictureData(picture->uniqueID(),
-                                     sk_sp<SkData>(stream.copyToData()))));
+                     cc::PictureData(picture->uniqueID(), data)));

[f(malita), 2016/09/16 13:18:09]

nit: std::move(data)

 }
 
 }  // namespace engine