Check Read permissions when getDocumentMetadata

Test: manually tested
Bug: 151095863

Change-Id: I4f04f08f76d039196c2c67bac80d4a46ebec87f2
(cherry picked from commit 0e75809955)

core/java/android/provider/DocumentsProvider.java

@@ -1144,6 +1144,8 @@ public abstract class DocumentsProvider extends ContentProvider {
 
             out.putParcelable(DocumentsContract.EXTRA_RESULT, path);
         } else if (METHOD_GET_DOCUMENT_METADATA.equals(method)) {
+            enforceReadPermissionInner(documentUri, getCallingPackage(),
+                    getCallingAttributionTag(), null);
             return getDocumentMetadata(documentId);
         } else {
             throw new UnsupportedOperationException("Method not supported " + method);