Framework to allow Chromoting host to respect NAT traversal policy in linux.

remoting/host/plugin/policy_hack/nat_policy_mac.mm

Index: remoting/host/plugin/policy_hack/nat_policy_mac.mm
diff --git a/remoting/host/plugin/policy_hack/nat_policy_mac.mm b/remoting/host/plugin/policy_hack/nat_policy_mac.mm
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+// Copyright (c) 2011 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/plugin/policy_hack/nat_policy.h"
+
+#include "base/compiler_specific.h"
+#include "base/message_loop_proxy.h"
+#include "base/synchronization/waitable_event.h"
+
+namespace remoting {
+namespace policy_hack {
+
+class NatPolicyMac : public NatPolicy {
+ public:
+  NatPolicyMac() {
+  }
+
+  virtual ~NatPolicyMac() {
+  }
+
+  virtual void StartWatching(const NatEnabledCallback& nat_enabled_cb)
+      OVERRIDE {
+    nat_enabled_cb_ = nat_enabled_cb;
+    nat_enabled_cb_.Run(false);
+  }
+
+  virtual void StopWatching(base::WaitableEvent* done) OVERRIDE {
+    nat_enabled_cb_.Reset();
+    done->Signal();
+  }
+
+ private:
+  NatEnabledCallback nat_enabled_cb_;
+};
+
+NatPolicy* NatPolicy::Create(base::MessageLoopProxy* message_loop_proxy) {
+  return new NatPolicyMac();
+}
+
+}  // namespace policy_hack
+}  // namespace remoting