Add SpaDialogActivity

Fix: 320199933
Test: Visual Test
Change-Id: Ic666c41940f78506c98e578e8987af9ad90ab998
diff --git a/packages/SettingsLib/Spa/gallery/AndroidManifest.xml b/packages/SettingsLib/Spa/gallery/AndroidManifest.xml
index 965fdcf..ed90284 100644
--- a/packages/SettingsLib/Spa/gallery/AndroidManifest.xml
+++ b/packages/SettingsLib/Spa/gallery/AndroidManifest.xml
@@ -73,6 +73,11 @@
             android:authorities="com.android.spa.gallery.debug.provider"
             android:exported="false">
         </provider>
-
+        <activity
+            android:name="com.android.settingslib.spa.gallery.SpaDialogActivity"
+            android:excludeFromRecents="true"
+            android:exported="true"
+            android:theme="@style/Theme.SpaLib.Dialog">
+        </activity>
     </application>
 </manifest>