Added Socket::SetBlocking() and Socket::SetNonBlocking().

runtime/bin/socket.h

Index: runtime/bin/socket.h
===================================================================
--- runtime/bin/socket.h	(revision 19251)
+++ runtime/bin/socket.h	(working copy)
@@ -51,6 +51,9 @@
   static Dart_Handle SetSocketIdNativeField(Dart_Handle socket, intptr_t id);
   static Dart_Handle GetSocketIdNativeField(Dart_Handle socket, intptr_t* id);
 
+  static bool SetNonBlocking(intptr_t fd);
+  static bool SetBlocking(intptr_t fd);

[siva, 2013/03/01 01:24:56]

Why not club these with all the socket operation methods above like Close,
GetRemotePeer, GetPort, Read, Write etc.

[Tom Ball, 2013/03/01 18:33:04]

Done.

+
  private:
   static dart::Mutex mutex_;
   static int service_ports_size_;