Add member localHostname() to the Dart IO Platform class.

runtime/bin/platform_win.cc

Index: runtime/bin/platform_win.cc
diff --git a/runtime/bin/platform_win.cc b/runtime/bin/platform_win.cc
index e1f9ced1f427cbc1c7f782303cebaf8d1bc3eede..22cc2dc28748fd2c3796350149801cf54656feca 100644
--- a/runtime/bin/platform_win.cc
+++ b/runtime/bin/platform_win.cc
@@ -3,11 +3,12 @@
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/platform.h"
+#include "bin/socket.h"
 
 
 bool Platform::Initialize() {
-  // Nothing to do on Windows.
-  return true;
+  // Load Socket for LocalHostname.

[Søren Gjesse, 2012/04/11 11:00:54]

I think we should consider moving this to LocalHostname as otherwise otherwise
WSAStartup will always be called even if no wininet2 operations (including
gethostname) are used.

You coukd have a static bool in either Platform::LocalHostname or
Socket::Initialize to check for multiple initiaizations.

Load -> Initialize

+  return Socket::Initialize();

[Anders Johnsen, 2012/04/11 10:12:12]

I would like to move the Socket::Initialize setup to a shared method, they both
Initialize methods can call. What you recon, and if it's a good idea, where
should that go?

 }
 
 
@@ -23,6 +24,11 @@ const char* Platform::OperatingSystem() {
 }
 
 
+bool Platform::LocalHostname(char *buffer, intptr_t buffer_length) {
+  return gethostname(buffer, buffer_length) == 0;
+}
+
+
 char* Platform::StrError(int error_code) {
   static const int kBufferSize = 1024;
   char* error = static_cast<char*>(malloc(kBufferSize));