Run art_boot before odsign.

It's necessary to have the right dalvik.vm.* flags in place when they
are validated by odrefresh.

Test: See the other CL in the topic.
Bug: 281850017
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:7c9c8f52e75daf30ae0cc6130c321769a23e320d)
Merged-In: Ib64790dde97faaa6b62ead2c1c8dd53c97f97f9c
Change-Id: Ib64790dde97faaa6b62ead2c1c8dd53c97f97f9c
diff --git a/rootdir/init.rc b/rootdir/init.rc
index d755b50..fdad273 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -1004,6 +1004,11 @@
     exec_start derive_classpath
     load_exports /data/system/environ/classpath
 
+    # Start ART's oneshot boot service to propagate boot experiment flags to
+    # dalvik.vm.*. This needs to be done before odsign since odrefresh uses and
+    # validates those properties against the signed cache-info.xml.
+    exec_start art_boot
+
     # Start the on-device signing daemon, and wait for it to finish, to ensure
     # ART artifacts are generated if needed.
     # Must start after 'derive_classpath' to have *CLASSPATH variables set.