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 5b5f0af0fec8ab02b13a4ef1d276a5559c53147b..0dc2476dc401bb25af63d569156eb5fb83550794 100644
--- a/chrome/browser/policy/proto/chrome_device_policy.proto
+++ b/chrome/browser/policy/proto/chrome_device_policy.proto
@@ -109,6 +109,28 @@ message AppPackProto {
   repeated AppPackEntryProto app_pack = 1;
 }
 
+message ForcedLogoutTimeoutsProto {
+  // All timeouts are specified in milliseconds.
+
+  // Specifies the timeout before an idle user session is terminated.
+  // If this field is omitted or set to 0, no idle timeout will be performed.

[Mattias Nissler (ping if slow), 2012/03/01 19:58:10]

"no idle timeout will be performed": Not clear what this means? I guess we don't
do idle logouts in that case?

[pastarmovj, 2012/03/05 17:02:55]

Done.

+  optional int64 idle_logout_timeout = 1;
+  // Specifies the duration of a warning countdown before the user is logged out
+  // because of idleness as specified by the |idle_logout_timeout| value.
+  // This field is only used if |idle_logout_timeout| is specified.

[Mattias Nissler (ping if slow), 2012/03/01 19:58:10]

not quite accurate, should be if |idle_logut_timeout| > 0.

[pastarmovj, 2012/03/05 17:02:55]

Done.

+  optional int64 idle_logout_warning_duration = 2;
+}
+
+message ScreenSaverProto {
+  // Specifies the extension ID which is to be used as a screen saver.

[Mattias Nissler (ping if slow), 2012/03/01 19:58:10]

We should point out that this screen saver applies to pre-login only. Somebody
who doesn't have context will believe this is the session screensaver.

[pastarmovj, 2012/03/05 17:02:55]

Done.

+  optional string screen_saver_extension_id = 1;
+  // Specified in milliseconds the timeout before the screen saver is activated

[Mattias Nissler (ping if slow), 2012/03/01 19:58:10]

grammar

[pastarmovj, 2012/03/05 17:02:55]

Done.

+  // on the login screen if no user activity present. Only respected if the

[Mattias Nissler (ping if slow), 2012/03/01 19:58:10]

oh, so here it says login screen. Can we move that to a comment on the message?

[pastarmovj, 2012/03/05 17:02:55]

Done.

+  // device is in KIOSK mode.
+  // If this field is omitted or set to 0, no screen-saver will be started.
+  optional int64 screen_saver_timeout = 2;
+}
+
 message ChromeDeviceSettingsProto {
   optional DevicePolicyRefreshRateProto device_policy_refresh_rate = 1;
   optional UserWhitelistProto user_whitelist = 2;
@@ -124,4 +146,6 @@ message ChromeDeviceSettingsProto {
   optional DeviceReportingProto device_reporting = 12;
   optional EphemeralUsersEnabledProto ephemeral_users_enabled = 13;
   optional AppPackProto app_pack = 14;
+  optional ForcedLogoutTimeoutsProto forced_logout_timeouts = 15;
+  optional ScreenSaverProto screen_saver = 16;
 }