Make socket send and receive more robust and return 0 on failure.

src/platform.h

Index: src/platform.h
diff --git a/src/platform.h b/src/platform.h
index 168791a0a4a881df549f1dc20830a2c006c220b3..a2ddf7a625edd783e386cff61adc048a78d26370 100644
--- a/src/platform.h
+++ b/src/platform.h
@@ -1,4 +1,4 @@
-// Copyright 2011 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -653,6 +653,7 @@ class Socket {
   virtual bool Shutdown() = 0;
 
   // Data Transimission
+  // Return 0 on failure.
   virtual int Send(const char* data, int len) const = 0;
   virtual int Receive(char* data, int len) const = 0;