Add DISABLE_TCP_TRANSPORT flag in the Transport API.

remoting/host/plugin/policy_hack/nat_policy_linux.cc

Index: remoting/host/plugin/policy_hack/nat_policy_linux.cc
diff --git a/remoting/host/plugin/policy_hack/nat_policy_linux.cc b/remoting/host/plugin/policy_hack/nat_policy_linux.cc
index ac1fcd942f6192b01cae0ba63cdfca1b91d3d0ad..ce37905a5bf028a9f1469b3a8775efb4202bfb3d 100644
--- a/remoting/host/plugin/policy_hack/nat_policy_linux.cc
+++ b/remoting/host/plugin/policy_hack/nat_policy_linux.cc
@@ -71,6 +71,8 @@ class NatPolicyLinux : public NatPolicy {
       OnFilePathError(config_dir_);
     }
 
+    LOG(ERROR) << "Start Watching";
+
     // There might have been changes to the directory in the time between
     // construction of the loader and initialization of the watcher. Call reload
     // to detect if that is the case.
@@ -80,6 +82,7 @@ class NatPolicyLinux : public NatPolicy {
   }
 
   virtual void StopWatchingInternal() OVERRIDE {
+    LOG(ERROR) << "Stop Watching";
     DCHECK(OnPolicyThread());
     // Cancel any inflight requests.
     watcher_.reset();