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

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


BUG=
TEST=

Committed: https://code.google.com/p/dart/source/detail?r=6409

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

https://chromiumcodereview.appspot.com/10050011/diff/1/runtime/bin/platform_w...
File runtime/bin/platform_win.cc (right):

https://chromiumcodereview.appspot.com/10050011/diff/1/runtime/bin/platform_w...
runtime/bin/platform_win.cc:11: return Socket::Initialize();
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?

https://chromiumcodereview.appspot.com/10050011/diff/1/tests/standalone/src/i...
File tests/standalone/src/io/PlatformTest.dart (right):

https://chromiumcodereview.appspot.com/10050011/diff/1/tests/standalone/src/i...
tests/standalone/src/io/PlatformTest.dart:15: Expect.isTrue(hostname is String
&& hostname != "");
Should we try and extract the real hostname by using Process to some system
call, or just keep it as is? 

Also, my assumption here is that a legal hostname can not be empty.

[Søren Gjesse, 2012-04-11 11:00:54]

lgtm

https://chromiumcodereview.appspot.com/10050011/diff/1/runtime/bin/platform_w...
File runtime/bin/platform_win.cc (right):

https://chromiumcodereview.appspot.com/10050011/diff/1/runtime/bin/platform_w...
runtime/bin/platform_win.cc:10: // Load Socket for LocalHostname.
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