Suspend (rather than shut down) the host upon policy errors.

remoting/resources/remoting_strings.grd

Index: remoting/resources/remoting_strings.grd
diff --git a/remoting/resources/remoting_strings.grd b/remoting/resources/remoting_strings.grd
index c27df6687089082cfd955a02aabbe98af98a8ec9..89d1d53879dc0d9abf4384edac5c7551018151e2 100644
--- a/remoting/resources/remoting_strings.grd
+++ b/remoting/resources/remoting_strings.grd
@@ -885,6 +885,18 @@ For information about privacy, please see the Google Privacy Policy (http://goo.
                name="IDS_OFFLINE_REASON_LOGIN_SCREEN_NOT_SUPPORTED">
         Host running at the console logic screen has shutdown to support curtain mode by switching to a host running in a user-specific session.
       </message>
+      <message desc="Error message indicating that the host is offline, because the host policy was unreadable (unparseable, inaccessible, mistyped or malformed)."
+               name="IDS_OFFLINE_REASON_POLICY_READ_ERROR">
+        Host failed to read the policy.
+      </message>
+      <message desc="Error message indicating that the host is temporarily offline, because the host is restarting (most likely due to a policy or config change that requires shutting down existing connections first)."
+               name="IDS_OFFLINE_REASON_RESTARTING">

[Wez, 2015/02/12 21:07:07]

Do these really need localizing? Where in the UI are they displayed?

[Łukasz Anforowicz, 2015/02/12 22:51:13]

Good question.  An alternative would be to only localize "This is a
host-offline-reason" part and append host-offline-reason verbatim, saying that
this is a "code" (and any similarity to English is accidental :-).  
Today, the WebApp UI shows this in a tooltop shown when hovering a mouse over a
hostname of a host that sent a host-offline-reason.  We need to add UI for
Android and iOS.  And I think we need to replace the tooltip with something more
discoverable (Jamie and Kelvin disagree / think that the tooltip is good
enough).

Also - today the user gets a somewhat cryptic, non-actionable, although at least
localized host-offline-reason.  Ideally we would guide the user to instructions
for how to analyze the host-side logs to get more info about the errors.  Maybe
we can add a link to the localized string?  (but today we don't have public
chromoting docs where "what do I do after getting host-offline-reason X" could
go).

[Wez, 2015/02/14 00:49:15]

No, if these end up in UX they should be localized; that's fine.

+        Host is restarting.
+      </message>
+      <message desc="Error message indicating that the host is offline, because another process has requested the host to shut down (via a SIGTERM signal)."
+               name="IDS_OFFLINE_REASON_SUCCESS_EXIT">
+        Host has shut down.
+      </message>
       <message desc="Error message indicating that the host is offline, because RemoteAccessHostMatchUsername policy is enabled and there is a mismatch between the name of the local user (that the host is associated with) and the name of the Google account registered as the host owner (i.e. 'johndoe' if the host is owned by 'johndoe@example.com' Google account)"
                name="IDS_OFFLINE_REASON_USERNAME_MISMATCH">
         Invalid host owner.