Add policies to control power management on the Chrome OS login screen

chrome/browser/policy/proto/chromeos/chrome_device_policy.proto

Index: chrome/browser/policy/proto/chromeos/chrome_device_policy.proto
diff --git a/chrome/browser/policy/proto/chromeos/chrome_device_policy.proto b/chrome/browser/policy/proto/chromeos/chrome_device_policy.proto
index 65fe798869d85eab827cf573da5d429538554d75..6242b2e29e2a85537667c0959f6465f61fc4f2d0 100644
--- a/chrome/browser/policy/proto/chromeos/chrome_device_policy.proto
+++ b/chrome/browser/policy/proto/chromeos/chrome_device_policy.proto
@@ -413,6 +413,75 @@ message SupervisedUsersSettingsProto {
   optional bool supervised_users_enabled = 1;
 }
 
+message LoginScreenPowerManagementProto {
+  // Configures power management on the login screen. The policy should be
+  // specified as a string that expresses the individual settings in JSON
+  // format, conforming to the following schema:
+  // {
+  //   "type": "object",
+  //   "properties": {
+  //     "AC": {
+  //       "type": "object",
+  //       "properties": {
+  //         "Delays": {
+  //           "type": "object",
+  //           "properties": {
+  //             "ScreenDim": {
+  //               "type": "integer",
+  //               "minimum": 0
+  //             },
+  //             "ScreenOff": {
+  //               "type": "integer",
+  //               "minimum": 0
+  //             },
+  //             "Idle": {
+  //               "type": "integer",
+  //               "minimum": 0
+  //             }
+  //           }
+  //         },
+  //         "IdleAction": {
+  //           "enum": [ 0, 2, 3 ]
+  //         }
+  //       }
+  //     },
+  //     "Battery": {
+  //       "type": "object",
+  //       "properties": {
+  //         "Delays": {
+  //           "type": "object",
+  //           "properties": {
+  //             "ScreenDim": {
+  //               "type": "integer",
+  //               "minimum": 0
+  //             },
+  //             "ScreenOff": {
+  //               "type": "integer",
+  //               "minimum": 0
+  //             },
+  //             "Idle": {
+  //               "type": "integer",
+  //               "minimum": 0
+  //             }
+  //           }
+  //         },
+  //         "IdleAction": {
+  //           "enum": [ 0, 2, 3 ]
+  //         }
+  //       }
+  //     },
+  //     "LidCloseAction": {
+  //       "enum": [ 0, 2, 3 ]
+  //     },
+  //     "UserActivityScreenDimDelayScale": {
+  //       "type": "integer",
+  //       "minimum": 0
+  //     }
+  //   }
+  // }
+  optional string login_screen_power_management = 1;
+}
+
 message ChromeDeviceSettingsProto {
   optional DevicePolicyRefreshRateProto device_policy_refresh_rate = 1;
   optional UserWhitelistProto user_whitelist = 2;
@@ -442,4 +511,5 @@ message ChromeDeviceSettingsProto {
   optional AttestationSettingsProto attestation_settings = 26;
   optional AccessibilitySettingsProto accessibility_settings = 27;
   optional SupervisedUsersSettingsProto supervised_users_settings = 28;
+  optional LoginScreenPowerManagementProto login_screen_power_management = 29;
 }