[Chromoting] Add a simple Windows app that registers and starts a host.

remoting/host/setup/pin_validator.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "remoting/host/setup/pin_validator.h"
+
+namespace remoting {
+
+bool IsPinValid(const std::string& pin) {

[Sergey Ulanov, 2012/10/15 23:44:26]

Already reviewed in another CL.

+  if (pin.length() < 6)
+    return false;
+  for (size_t i = 0; i < pin.length(); i++) {
+    char c = pin[i];
+    if (c < '0'  || c > '9')
+      return false;
+  }
+  return true;
+}
+
+}  // namespace remoting