Commit 27.0 sepolicy prebuilts to master.

Bug: 65551293
Bug: 69390067
Test: None. Prebuilt only change.
Change-Id: I62304b342a8b52fd505892cc2d4ebc882148224b
diff --git a/prebuilts/api/27.0/public/shared_relro.te b/prebuilts/api/27.0/public/shared_relro.te
new file mode 100644
index 0000000..91cf44d
--- /dev/null
+++ b/prebuilts/api/27.0/public/shared_relro.te
@@ -0,0 +1,9 @@
+# Process which creates/updates shared RELRO files to be used by other apps.
+type shared_relro, domain;
+
+# Grant write access to the shared relro files/directory.
+allow shared_relro shared_relro_file:dir rw_dir_perms;
+allow shared_relro shared_relro_file:file create_file_perms;
+
+# Needs to contact the "webviewupdate" and "activity" services
+allow shared_relro webviewupdate_service:service_manager find;