[Chromoting] Implement the host domain policy.

remoting/host/constants.h

Index: remoting/host/constants.h
diff --git a/remoting/host/constants.h b/remoting/host/constants.h
index 1737b34a4524f4bfb0254975dd849e36a36eda60..fb329061169535b20d4f002b4679ea6a37e039de 100644
--- a/remoting/host/constants.h
+++ b/remoting/host/constants.h
@@ -13,17 +13,22 @@ namespace remoting {
 // Please keep this enum in sync with:
 // remoting/host/installer/mac/PrivilegedHelperTools/
 // org.chromium.chromoting.me2me.sh
+// and remoting/tools/me2me_virtual_host.py.
 enum HostExitCodes {
+  // Error codes that don't indicate a permanent error condition.
   kSuccessExitCode = 0,
   kReservedForX11ExitCode = 1,
+
+  // Error codes that do indicate a permanent error condition.
   kInvalidHostConfigurationExitCode = 2,
   kInvalidHostIdExitCode = 3,
   kInvalidOauthCredentialsExitCode = 4,
+  kInvalidHostDomainExitCode = 5,
 
   // The range of the exit codes that should be interpreted as a permanent error
   // condition.
   kMinPermanentErrorExitCode = kInvalidHostConfigurationExitCode,
-  kMaxPermanentErrorExitCode = kInvalidOauthCredentialsExitCode
+  kMaxPermanentErrorExitCode = kInvalidHostDomainExitCode
 };
 
 #if defined(OS_WIN)