The helper query bridge in AccessibilityServiceManager missing capability.

1. The helper query bridge service did not have the now capability
   to query the screen content.

2. Fixing the build.

bug:8633951

Change-Id: Ief6a3387793710a83b83c18cc6c53b51dcda9bdf

services/java/com/android/server/accessibility/AccessibilityInputFilter.java

@@ -349,7 +349,7 @@ class AccessibilityInputFilter extends InputFilter implements EventStreamTransfo
         }
     }
 
-    private void disableFeatures() {
+    void disableFeatures() {
         if (mTouchExplorer != null) {
             mTouchExplorer.clear();
             mTouchExplorer.onDestroy();

services/java/com/android/server/accessibility/AccessibilityManagerService.java

@@ -797,6 +797,7 @@ public class AccessibilityManagerService extends IAccessibilityManager.Stub {
     private Service getQueryBridge() {
         if (mQueryBridge == null) {
             AccessibilityServiceInfo info = new AccessibilityServiceInfo();
+            info.setCapabilities(AccessibilityServiceInfo.CAPABILITY_CAN_RETRIEVE_WINDOW_CONTENT);
             mQueryBridge = new Service(UserHandle.USER_NULL,
                     sFakeAccessibilityServiceComponentName, info);
         }