Add feature flag for flagging manifest entries

Test: Presubmit only
Bug: 297373084
Merged-In: I499b6a99e53775abf084f741802463940730091a
Change-Id: I499b6a99e53775abf084f741802463940730091a
diff --git a/core/java/android/content/res/flags.aconfig b/core/java/android/content/res/flags.aconfig
index 0c2c0f4..b0e2342 100644
--- a/core/java/android/content/res/flags.aconfig
+++ b/core/java/android/content/res/flags.aconfig
@@ -8,3 +8,12 @@
     # fixed_read_only or device wont boot because of permission issues accessing flags during boot
     is_fixed_read_only: true
 }
+
+flag {
+    name: "manifest_flagging"
+    namespace: "resource_manager"
+    description: "Feature flag for flagging manifest entries"
+    bug: "297373084"
+    # This flag is read in PackageParser at boot time, and in aapt2 which is a build tool.
+    is_fixed_read_only: true
+}