MessageQueue: Add flag for tail tracking optimization

This has to be fixed-readonly as MessageQueue can be
initialized before SettingsProvider comes up.

Bug: 305311707
Test: Build, check that flag can be turned on and off
Change-Id: I25e0aff42446165a1321d7b2953bbc918e04acc4

parent 07c812e2

core/java/android/os/flags.aconfig

+8 −0

Original line number	Diff line number	Diff line
		@@ -98,3 +98,11 @@ flag {
		description: "Guards StrictMode APIs for detecting restricted network access."
		bug: "317250784"
		}

		flag {
		name: "message_queue_tail_tracking"
		namespace: "system_performance"
		description: "track tail of message queue."
		bug: "305311707"
		is_fixed_read_only: true
		}