Make background media saving a service

bug:8091328
Change-Id: If35c1832238e921b6582d8642fdbaa4378ea0c48
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 360128c..d497283 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -390,6 +390,7 @@
                 android:theme="@style/Theme.ProxyLauncher">
         </activity>
         <service android:name="com.android.gallery3d.app.BatchService" />
+        <service android:name="com.android.camera.MediaSaveService" />
         <!-- canvas -->
         <provider
             android:name="com.android.gallery3d.provider.CanvasProvider"