Move keyguard enabled to Component Override

When using RROs, android:enabled="@bool/form_factor_flag" won't work any
more. So we need to use a component override flag per b/135048762.

Test: Flash an adt3 with RRO enabled. see that systemui is coming up.
Bug: 173138807
Change-Id: If9a99f850ebb34755b4146b786c189f9fb590c3d

packages/SystemUI/AndroidManifest.xml

@@ -623,8 +623,7 @@
 
         <service
             android:name=".keyguard.KeyguardService"
-            android:exported="true"
+            android:exported="true" />
-            android:enabled="@bool/config_enableKeyguardService" />
 
         <activity android:name=".keyguard.WorkLockActivity"
                   android:label="@string/accessibility_desc_work_lock"

packages/SystemUI/res/values-television/config.xml

@@ -44,9 +44,6 @@
         <item>com.android.systemui.wmshell.WMShell</item>
     </string-array>
 
-    <!-- Disable KeyguardService -->
-    <bool name="config_enableKeyguardService">false</bool>
-
     <!-- Svelte specific logic, see RecentsConfiguration.SVELTE_* constants. -->
     <integer name="recents_svelte_level">3</integer>
 

packages/SystemUI/res/values/config.xml

@@ -161,9 +161,6 @@
     <!-- The number of milliseconds to extend ambient pulse by when prompted (e.g. on touch) -->
     <integer name="ambient_notification_extension_time">10000</integer>
 
-    <!-- Whether to enable KeyguardService or not -->
-    <bool name="config_enableKeyguardService">true</bool>
-
     <!-- The maximum count of notifications on Keyguard. The rest will be collapsed in an overflow
      card. -->
     <integer name="keyguard_max_notification_count">3</integer>

packages/SystemUI/src/com/android/systemui/keyguard/KeyguardViewMediator.java

@@ -34,10 +34,12 @@ import android.app.PendingIntent;
 import android.app.StatusBarManager;
 import android.app.trust.TrustManager;
 import android.content.BroadcastReceiver;
+import android.content.ComponentName;
 import android.content.ContentResolver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
+import android.content.pm.PackageManager.NameNotFoundException;
 import android.content.pm.UserInfo;
 import android.hardware.biometrics.BiometricSourceType;
 import android.media.AudioAttributes;
@@ -88,6 +90,7 @@ import com.android.systemui.SystemUI;
 import com.android.systemui.broadcast.BroadcastDispatcher;
 import com.android.systemui.dagger.qualifiers.UiBackground;
 import com.android.systemui.dump.DumpManager;
+import com.android.systemui.keyguard.KeyguardService;
 import com.android.systemui.keyguard.dagger.KeyguardModule;
 import com.android.systemui.navigationbar.NavigationModeController;
 import com.android.systemui.plugins.FalsingManager;
@@ -779,7 +782,7 @@ public class KeyguardViewMediator extends SystemUI implements Dumpable {
 
         // Assume keyguard is showing (unless it's disabled) until we know for sure, unless Keyguard
         // is disabled.
-        if (mContext.getResources().getBoolean(R.bool.config_enableKeyguardService)) {
+        if (isKeyguardServiceEnabled()) {
             setShowingLocked(!shouldWaitForProvisioning()
                     && !mLockPatternUtils.isLockScreenDisabled(
                             KeyguardUpdateMonitor.getCurrentUser()), true /* forceCallbacks */);
@@ -957,6 +960,15 @@ public class KeyguardViewMediator extends SystemUI implements Dumpable {
         mUpdateMonitor.dispatchFinishedGoingToSleep(why);
     }
 
+    private boolean isKeyguardServiceEnabled() {
+        try {
+            return mContext.getPackageManager().getServiceInfo(
+                    new ComponentName(mContext, KeyguardService.class), 0).isEnabled();
+        } catch (NameNotFoundException e) {
+            return true;
+        }
+    }
+
     private long getLockTimeout(int userId) {
         // if the screen turned off because of timeout or the user hit the power button
         // and we don't need to lock immediately, set an alarm