Actually end a ZLib stream with a Z_FINISH marker.

runtime/bin/io_natives.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/io_natives.h"
 
 #include <stdlib.h>
 #include <string.h>
 
 #include "bin/builtin.h"
@@ skipping 10 matching lines @@
 // builtin_natives.cc instead.
 #define IO_NATIVE_LIST(V)                                                      \
   V(Common_IsBuiltinList, 1)                                                   \
   V(Crypto_GetRandomBytes, 1)                                                  \
   V(EventHandler_Start, 1)                                                     \
   V(EventHandler_SendData, 4)                                                  \
   V(Filter_CreateZLibDeflate, 3)                                               \
   V(Filter_CreateZLibInflate, 1)                                               \
   V(Filter_End, 1)                                                             \
   V(Filter_Process, 2)                                                         \
-  V(Filter_Processed, 2)                                                       \
+  V(Filter_Processed, 3)                                                       \
   V(InternetAddress_Fixed, 1)                                                  \
   V(Platform_NumberOfProcessors, 0)                                            \
   V(Platform_OperatingSystem, 0)                                               \
   V(Platform_PathSeparator, 0)                                                 \
   V(Platform_LocalHostname, 0)                                                 \
   V(Platform_Environment, 0)                                                   \
   V(Process_Start, 10)                                                         \
   V(Process_Kill, 3)                                                           \
   V(Process_SetExitCode, 1)                                                    \
   V(Process_Exit, 1)                                                           \
@@ skipping 49 matching lines @@
     if (!strcmp(function_name, entry->name_) &&
         (entry->argument_count_ == argument_count)) {
       return reinterpret_cast<Dart_NativeFunction>(entry->function_);
     }
   }
   return NULL;
 }
 
 }  // namespace bin
 }  // namespace dart