[GWP-ASan] Add sysprop, allow shell and system apps to set it.

Bug: 219651032
Test: atest bionic-unit-tests

Change-Id: Ic4804ce0e4f3b6ba8eb8d82aca11b400b45c03dc
diff --git a/private/property_contexts b/private/property_contexts
index 04e77e4..e81ceb1 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -719,6 +719,10 @@
 libc.debug.malloc.program u:object_r:libc_debug_prop:s0 exact string
 libc.debug.hooks.enable   u:object_r:libc_debug_prop:s0 exact string
 
+# GWP-ASan props. Separate from other libc.debug.* props, because we want users
+# to be able to set them from `adb shell` even on release devices.
+libc.debug.gwp_asan.  u:object_r:gwp_asan_prop:s0 prefix string
+
 # shell-only props for ARM memory tagging (MTE).
 arm64.memtag. u:object_r:arm64_memtag_prop:s0 prefix string
 persist.arm64.memtag.default u:object_r:arm64_memtag_prop:s0 exact string