Implement debugger connection on Windows.

Implement debugger connection on Windows.

This is a slightly cleaned up version of the code that Devon
created.

All of eventhandler and socket in bin is designed for async
communication only. Therefore, it does not make much sense
to use it for something as simple as this. I have put the
sync send and receive operations into DebuggerConnectionImpl
instead of attempting to use the async Socket::Read and
Socket::Write.

R=devoncarew@google.com,sgjesse@google.com,hausner@google.com
BUG=

Committed: https://code.google.com/p/dart/source/detail?r=16336

[Mads Ager (google), 2012-12-19 13:18:40]

I verified this on Linux and Windows and it passes Matthias's test uploaded at: 
https://codereview.chromium.org/11576053/

[hausner, 2012-12-19 18:19:20]

Thank you. The simplifications LGTM. I uploaded the debugger wire api test, you
can enable the test for Windows in standalone.status.

[Mads Ager (google), 2012-12-19 18:43:03]

On 2012/12/19 18:19:20, hausner wrote:
> Thank you. The simplifications LGTM. I uploaded the debugger wire api test,
you
> can enable the test for Windows in standalone.status.

Excellent. Done!