Added synchronous socket implementation to dart:io.

runtime/bin/io_natives.cc

Index: runtime/bin/io_natives.cc
diff --git a/runtime/bin/io_natives.cc b/runtime/bin/io_natives.cc
index 32279340cf11656af6ff1f9aa044e9350576aaa2..b3a14e134f7a19d0387226467152810b4b3429be 100644
--- a/runtime/bin/io_natives.cc
+++ b/runtime/bin/io_natives.cc
@@ -151,6 +151,17 @@ namespace bin {
   V(Stdout_GetTerminalSize, 1)                                                 \
   V(Stdout_AnsiSupported, 1)                                                   \
   V(StringToSystemEncoding, 1)                                                 \
+  V(SynchronousSocket_Available, 1)                                            \
+  V(SynchronousSocket_CloseSync, 1)                                            \
+  V(SynchronousSocket_CreateConnectSync, 3)                                    \
+  V(SynchronousSocket_GetPort, 1)                                              \
+  V(SynchronousSocket_GetRemotePeer, 1)                                        \
+  V(SynchronousSocket_LookupRequest, 2)                                        \
+  V(SynchronousSocket_ShutdownRead, 1)                                         \
+  V(SynchronousSocket_ShutdownWrite, 1)                                        \
+  V(SynchronousSocket_Read, 2)                                                 \
+  V(SynchronousSocket_ReadList, 4)                                             \
+  V(SynchronousSocket_WriteList, 4)                                            \
   V(SystemEncodingToString, 1)                                                 \
   V(X509_Subject, 1)                                                           \
   V(X509_Issuer, 1)                                                            \