Introduce (private) ZLibFilter to dart:io.

runtime/bin/builtin_natives.cc

 // Copyright (c) 2012, 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/builtin.h"
 
 #include <stdlib.h>
 #include <string.h>
 
 #include "bin/dartutils.h"
@@ skipping 30 matching lines @@
   V(File_LengthFromName, 1)                                                    \
   V(File_LastModified, 1)                                                      \
   V(File_Flush, 1)                                                             \
   V(File_Create, 1)                                                            \
   V(File_Delete, 1)                                                            \
   V(File_Directory, 1)                                                         \
   V(File_FullPath, 1)                                                          \
   V(File_OpenStdio, 1)                                                         \
   V(File_GetStdioHandleType, 1)                                                \
   V(File_NewServicePort, 0)                                                    \
+  V(Filter_CreateZLIB, 1)                                                      \
   V(Logger_PrintString, 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(ServerSocket_CreateBindListen, 4)                                          \
   V(ServerSocket_Accept, 2)                                                    \
@@ skipping 66 matching lines @@
 
 
 void FUNCTION_NAME(Exit)(Dart_NativeArguments args) {
   Dart_EnterScope();
   int64_t status = 0;
   // Ignore result if passing invalid argument and just exit 0.
   DartUtils::GetInt64Value(Dart_GetNativeArgument(args, 0), &status);
   Dart_ExitScope();
   exit(status);
 }