Make WebViewUpdateService accessible by isolated apps.

It's okay for isolated apps to connect to the webview update service to
find out which APK is WebView. This enables isolated renderer processes
to load their code from the WebView APK.

Change-Id: I7441ba1bc462895a47126cd065aa6f8ca254467f
diff --git a/services/core/java/com/android/server/webkit/WebViewUpdateService.java b/services/core/java/com/android/server/webkit/WebViewUpdateService.java
index 9c770e1..2db6b5d 100644
--- a/services/core/java/com/android/server/webkit/WebViewUpdateService.java
+++ b/services/core/java/com/android/server/webkit/WebViewUpdateService.java
@@ -190,7 +190,7 @@
         userAddedFilter.addAction(Intent.ACTION_USER_ADDED);
         getContext().registerReceiver(mWebViewUpdatedReceiver, userAddedFilter);
 
-        publishBinderService("webviewupdate", new BinderService());
+        publishBinderService("webviewupdate", new BinderService(), true /*allowIsolated*/);
     }
 
     private static boolean existsValidNonFallbackProvider(WebViewProviderInfo[] providers) {