Add HideNonSystemOverlayMixin for SpaActivity

Fix: 315473158
Test: manual - try overlay on SpaActivity
Change-Id: I67f30f6aa0adb22f891683a6d603fb6cb146b4f1
diff --git a/src/com/android/settings/spa/SpaActivity.kt b/src/com/android/settings/spa/SpaActivity.kt
index e5bee8b..5eade81 100644
--- a/src/com/android/settings/spa/SpaActivity.kt
+++ b/src/com/android/settings/spa/SpaActivity.kt
@@ -18,9 +18,11 @@
 
 import android.content.Context
 import android.content.Intent
+import android.os.Bundle
 import android.util.Log
 import androidx.annotation.VisibleForTesting
 import com.android.settings.spa.app.appinfo.AppInfoSettingsProvider
+import com.android.settingslib.core.lifecycle.HideNonSystemOverlayMixin
 import com.android.settingslib.spa.framework.BrowseActivity
 import com.android.settingslib.spa.framework.common.SettingsPage
 import com.android.settingslib.spa.framework.util.SESSION_BROWSE
@@ -31,6 +33,11 @@
     override fun isPageEnabled(page: SettingsPage) =
         super.isPageEnabled(page) && !isSuwAndPageBlocked(page.sppName)
 
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        lifecycle.addObserver(HideNonSystemOverlayMixin(this))
+    }
+
     companion object {
         private const val TAG = "SpaActivity"