Add device policies to control accessibility settings on the 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 5d83a8a682f66209e041b00018a5a90b69982b61..2ba6519e1906761269bb48211fa175087b56b53b 100644
--- a/chrome/browser/policy/proto/chromeos/chrome_device_policy.proto
+++ b/chrome/browser/policy/proto/chromeos/chrome_device_policy.proto
@@ -347,6 +347,67 @@ message AttestationSettingsProto {
   optional bool attestation_enabled = 1;
 }
 
+message AccessibilitySettingsProto {
+  // Sets the default state of the large cursor accessibility feature on the
+  // login screen. If this policy is set to true, the large cursor will be
+  // enabled when the login screen is shown. If this policy is set to false, the
+  // large cursor will be disabled when the login screen is shown. Users can
+  // temporarily override this setting by enabling or disabling the large
+  // cursor. However, the user's choice is not persistent and the default is
+  // restored whenever the login screen is shown anew or the user remains idle
+  // on the login screen for a minute. If this policy is left unset, the large
+  // cursor is disabled when the login screen is first shown. Users can enable
+  // or disable the large cursor anytime and its status on the login screen is
+  // persisted between users.
+  optional bool login_screen_default_large_cursor_enabled = 1;
+
+  // Sets the default state of the spoken feedback accessibility feature on the
+  // login screen. If this policy is set to true, spoken feedback will be
+  // enabled when the login screen is shown. If this policy is set to false,
+  // spoken feedback will be disabled when the login screen is shown. Users can
+  // temporarily override this setting by enabling or disabling spoken feedback.
+  // However, the user's choice is not persistent and the default is restored
+  // whenever the login screen is shown anew or the user remains idle on the
+  // login screen for a minute. If this policy is left unset, spoken feedback is
+  // disabled when the login screen is first shown. Users can enable or disable
+  // spoken feedback anytime and its status on the login screen is persisted
+  // between users.
+  optional bool login_screen_default_spoken_feedback_enabled = 2;
+
+  // Sets the default state of the high contrast mode accessibility feature on
+  // the login screen. If this policy is set to true, high contrast mode will be
+  // enabled when the login screen is shown. If this policy is set to false,
+  // high contrast mode will be disabled when the login screen is shown. Users
+  // can temporarily override this setting by enabling or disabling high
+  // contrast mode. However, the user's choice is not persistent and the default
+  // is restored whenever the login screen is shown anew or the user remains
+  // idle on the login screen for a minute. If this policy is left unset, high
+  // contrast mode is disabled when the login screen is first shown. Users can
+  // enable or disable high contrast mode anytime and its status on the login
+  // screen is persisted between users.
+  optional bool login_screen_default_high_contrast_enabled = 3;
+
+  // Enumerates the screen magnifier types.
+  enum ScreenMagnifierType {
+    // Screen magnifier disabled.
+    SCREEN_MAGNIFIER_TYPE_NONE = 0;
+    // Full-screen magnifier enabled.
+    SCREEN_MAGNIFIER_TYPE_FULL = 1;
+  };
+
+  // Sets the default type of screen magnifier that is enabled on the login
+  // screen. If this policy is set, it controls the type of screen magnifier
+  // that is enabled when the login screen is shown. Users can temporarily
+  // override this setting by enabling or disabling the screen magnifier.
+  // However, the user's choice is not persistent and the default is restored
+  // whenever the login screen is shown anew or the user remains idle on the
+  // login screen for a minute. If this policy is left unset, the screen
+  // magnifier is disabled when the login screen is first shown. Users can
+  // enable or disable the screen magnifier anytime and its status on the login
+  // screen is persisted between users.
+  optional ScreenMagnifierType login_screen_default_screen_magnifier_type = 4;
+}
+
 message ChromeDeviceSettingsProto {
   optional DevicePolicyRefreshRateProto device_policy_refresh_rate = 1;
   optional UserWhitelistProto user_whitelist = 2;
@@ -374,4 +435,5 @@ message ChromeDeviceSettingsProto {
   optional UptimeLimitProto uptime_limit = 24;
   optional VariationsParameterProto variations_parameter = 25;
   optional AttestationSettingsProto attestation_settings = 26;
+  optional AccessibilitySettingsProto accessibility_settings = 27;
 }