Expose Lock screen settings page.

Test: atest
Bug: 188105349
Change-Id: I7646f712608076037634c26d2334de4367b4452b

AndroidManifest.xml

@@ -1078,6 +1078,20 @@
                        android:value="true" />
         </activity>
 
+        <activity
+            android:name=".Settings$LockScreenSettingsActivity"
+            android:label="@string/lockscreen_settings_title"
+            android:exported="true">
+            <intent-filter android:priority="1">
+                <action android:name="android.settings.LOCK_SCREEN_SETTINGS" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+            <meta-data android:name="com.android.settings.FRAGMENT_CLASS"
+                       android:value="com.android.settings.security.LockscreenDashboardFragment" />
+            <meta-data android:name="com.android.settings.PRIMARY_PROFILE_CONTROLLED"
+                       android:value="true" />
+        </activity>
+
         <activity
             android:name="SettingsLicenseActivity"
             android:label="@string/settings_license_activity_title"

src/com/android/settings/Settings.java

@@ -119,6 +119,10 @@ public class Settings extends SettingsActivity {
     public static class AccessibilityInversionSettingsActivity extends SettingsActivity { /* empty */ }
     public static class AccessibilityContrastSettingsActivity extends SettingsActivity { /* empty */ }
     public static class AccessibilityDaltonizerSettingsActivity extends SettingsActivity { /* empty */ }
+    /**
+     * Activity for lockscreen settings.
+     */
+    public static class LockScreenSettingsActivity extends SettingsActivity { /* empty */ }
     /**
      * Activity for Reduce Bright Colors.
      */