Move Platform class to dartlib_io target.

runtime/bin/io_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/io_natives.h"
 
 #include <stdlib.h>
 #include <string.h>
 
 #include "bin/builtin.h"
 #include "bin/dartutils.h"
 #include "include/dart_api.h"
 #include "platform/assert.h"
 
 
 // Lists the native functions implementing advanced dart:io classes.
 // Some classes, like File and Directory, list their implementations in
 // 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(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)                                                    \
   V(Socket_CreateConnect, 3)                                                   \
   V(Socket_Available, 1)                                                       \
   V(Socket_Read, 2)                                                            \
   V(Socket_ReadList, 4)                                                        \
   V(Socket_WriteList, 4)                                                       \
   V(Socket_GetPort, 1)                                                         \
@@ skipping 23 matching lines @@
   int num_entries = sizeof(IOEntries) / sizeof(struct NativeEntries);
   for (int i = 0; i < num_entries; i++) {
     struct NativeEntries* entry = &(IOEntries[i]);
     if (!strcmp(function_name, entry->name_) &&
         (entry->argument_count_ == argument_count)) {
       return reinterpret_cast<Dart_NativeFunction>(entry->function_);
     }
   }
   return NULL;
 }