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..ff58e55812a0365a521e63eadf436a2fd8f1d391 100644
--- a/chrome/browser/policy/proto/chrome_device_policy.proto
+++ b/chrome/browser/policy/proto/chrome_device_policy.proto
@@ -109,6 +109,29 @@ message AppPackProto {
   repeated AppPackEntryProto app_pack = 1;
 }
 
+message ForcedLogoutTimeoutsProto {
+  // All timeouts are specified in milliseconds.

[Joao da Silva, 2012/03/05 17:40:24]

These policies are only valid in Kiosk mode too, right? If so, mention it in
this comment.

[pastarmovj, 2012/03/06 11:59:35]

I think we discussed that those policies might be used for normal logins too at
some point so I'd rather keep this description more general.

+
+  // Specifies the timeout before an idle user session is terminated.
+  // If this field is omitted or set to 0, no logout on idle will be performed.
+  optional int64 idle_logout_timeout = 1;

[Joao da Silva, 2012/03/05 17:40:24]

Nit: newline after this line.

[pastarmovj, 2012/03/06 11:59:35]

Done.

+  // 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| != 0 is specified.
+  optional int64 idle_logout_warning_duration = 2;
+}
+
+message ScreenSaverProto {
+  // Specifies the extension ID which is to be used as a screen saver on the
+  // login screen if no user activity is present. Only respected if the device
+  // is in KIOSK mode.
+  optional string screen_saver_extension_id = 1;

[Joao da Silva, 2012/03/05 17:40:24]

Nit: newline after this line.

[pastarmovj, 2012/03/06 11:59:35]

Done.

+  // Specifies the timeout before the screen saver is activated. If this field
+  // is omitted or set to 0, no screen-saver will be started.
+  // Measured in milliseconds.
+  optional int64 screen_saver_timeout = 2;
+}
+
 message ChromeDeviceSettingsProto {
   optional DevicePolicyRefreshRateProto device_policy_refresh_rate = 1;
   optional UserWhitelistProto user_whitelist = 2;
@@ -124,4 +147,6 @@ 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;

[Joao da Silva, 2012/03/05 17:40:24]

Suggestion: call this login_screen_saver instead?

[pastarmovj, 2012/03/06 11:59:35]

Done.

 }