Add the protobufs for the set of session timeout policies planned for the kiosk mode.

chrome/browser/policy/proto/chrome_device_policy.proto

Index: chrome/browser/policy/proto/chrome_device_policy.proto
diff --git a/chrome/browser/policy/proto/chrome_device_policy.proto b/chrome/browser/policy/proto/chrome_device_policy.proto
index 07dd07ead8b81d21c56fefef5100ac077cdc4d9c..990e6c7bc9156d9bf0a486fbe8acef9018d3d313 100644
--- a/chrome/browser/policy/proto/chrome_device_policy.proto
+++ b/chrome/browser/policy/proto/chrome_device_policy.proto
@@ -97,6 +97,34 @@ message EphemeralUsersEnabledProto {
   optional bool ephemeral_users_enabled = 1;
 }
 
+message ForcedLogoutTimeoutsProto {
+  // All timeouts are specified in milliseconds.
+
+  // Specifies the duration of a session before the user is unconditionally
+  // logged out.
+  // If omitted or set to 0. No idle timeout will be performed.

[Mattias Nissler (ping if slow), 2012/02/21 10:41:38]

Please fix comment grammar, here and below.

[pastarmovj, 2012/02/22 14:22:27]

Done.

+  optional int64 forced_logout_timeout = 1;
+  // Specifies the duration of a warning countdown before the user is logged out
+  // because of the |forced_logout_timeout| has been set.
+  // Only used if |forced_logout_timeout| is specified.
+  optional int64 forced_logout_warning_duration = 2;
+  // Specifies the timeout before an idle user session is terminated.
+  // If omitted or set to 0. No idle timeout will be performed.
+  optional int64 idle_logout_timeout = 3;
+  // Specifies the duration of a warning countdown before the user is logged out
+  // because of idleness as specified by the |idle_logout_timeout| value.
+  // Only used if |idle_logout_timeout| is specified.
+  optional int64 idle_logout_warning_duration = 4;

[rkc, 2012/02/21 18:15:36]

What's the difference between this and the forced_logout_warning_duration? Isn't
forced logout something that will only happen on idle timeout anyway?

[pastarmovj, 2012/02/22 14:22:27]

I thought somewhere along the course of discussion there was the idea to also
log out unconditionally after some time. But if this is not implemented yet we
can as well remove those fields until it is really needed.

[rkc, 2012/02/22 17:39:07]

Ah I see what you mean. No, we don't plan on having a forced logout in terms of
absolute time at the moment. Though let me check with Josh if that is something
we might need.

[rkc, 2012/02/23 21:10:13]

Spoke with Josh; the forced_logout_warning_duration and forced_logout_timeout
are not needed at this point. These are both tentative policies that have issues
that need to be worked out with before they should be implemented.

The idle_logout_timeout and idle_logout_warning_duration are the only two needed
here.

+}
+
+message ScreenSaverTimeout {
+  // Specified in milliseconds the timeout before the screen saver is activated
+  // on the login screen if no user activity present. Only respected if the
+  // device is in KIOSK mode.
+  // If omitted or set to 0. No idle timeout will be performed.
+  optional int64 screen_saver_timeout = 1;
+}
+
 message ChromeDeviceSettingsProto {
   optional DevicePolicyRefreshRateProto device_policy_refresh_rate = 1;
   optional UserWhitelistProto user_whitelist = 2;
@@ -111,4 +139,6 @@ message ChromeDeviceSettingsProto {
   optional DeviceOpenNetworkConfigurationProto open_network_configuration = 11;
   optional DeviceReportingProto device_reporting = 12;
   optional EphemeralUsersEnabledProto ephemeral_users_enabled = 13;
+  optional ForcedLogoutTimeoutsProto forced_logout_timeouts = 14;
+  optional ScreenSaverTimeout screen_saver_timeout = 15;
 }