Moved LRResolverRankerService to ExtServices, and added a permission to
ensure that ResolverRankerServices are from trust sources.

Test: manually shared images in Camera, and in PTP to confirm it works
as expected.

Change-Id: I3549292d424fec949e9115faea7a0c5bdec06e87
diff --git a/data/etc/privapp-permissions-platform.xml b/data/etc/privapp-permissions-platform.xml
index 7f07f03..efed165 100644
--- a/data/etc/privapp-permissions-platform.xml
+++ b/data/etc/privapp-permissions-platform.xml
@@ -356,4 +356,8 @@
         <permission name="android.permission.CONTROL_VPN"/>
     </privapp-permissions>
 
+    <privapp-permissions package="com.google.android.ext.services">
+        <permission name="android.permission.PROVIDE_RESOLVER_RANKER_SERVICE" />
+    </privapp-permissions>
+
 </permissions>