Update javadoc and log message to avoid confusion.

"visibility" is sometimes used to refer to (showing && !occluded).
Therefore removing the term from the doc and logging.

Bug: 216630470
Test: N/A
Change-Id: I03b36c99f201fbb8be382a81f2046c3fed5fce13

core/java/android/app/KeyguardManager.java

@@ -1103,9 +1103,12 @@ public class KeyguardManager {
     }
 
     /**
-     * Registers a listener to execute when the keyguard visibility changes.
+     * Registers a listener to execute when the keyguard locked state changes.
      *
-     * @param listener The listener to add to receive keyguard visibility changes.
+     * @param listener The listener to add to receive keyguard locked state changes.
+     *
+     * @see #isKeyguardLocked()
+     * @see #removeKeyguardLockedStateListener(KeyguardLockedStateListener)
      */
     @RequiresPermission(Manifest.permission.SUBSCRIBE_TO_KEYGUARD_LOCKED_STATE)
     public void addKeyguardLockedStateListener(@NonNull @CallbackExecutor Executor executor,
@@ -1124,7 +1127,12 @@ public class KeyguardManager {
     }
 
     /**
-     * Unregisters a listener that executes when the keyguard visibility changes.
+     * Unregisters a listener that executes when the keyguard locked state changes.
+     *
+     * @param listener The listener to remove.
+     *
+     * @see #isKeyguardLocked()
+     * @see #addKeyguardLockedStateListener(Executor, KeyguardLockedStateListener)
      */
     @RequiresPermission(Manifest.permission.SUBSCRIBE_TO_KEYGUARD_LOCKED_STATE)
     public void removeKeyguardLockedStateListener(@NonNull KeyguardLockedStateListener listener) {

services/core/java/com/android/server/wm/WindowManagerService.java

@@ -3278,7 +3278,7 @@ public class WindowManagerService extends IWindowManager.Stub
         mContext.enforceCallingOrSelfPermission(
                 Manifest.permission.SUBSCRIBE_TO_KEYGUARD_LOCKED_STATE,
                 Manifest.permission.SUBSCRIBE_TO_KEYGUARD_LOCKED_STATE
-                        + " permission required to read keyguard visibility");
+                        + " permission required to subscribe to keyguard locked state changes");
     }
 
     private void dispatchKeyguardLockedState() {