InputTracer: Trace motion and key events

Bug: 210460522
Test: manual with perfetto
Change-Id: I4bcac0b8bba5132d0e68815923ab8f89b2bede84
diff --git a/libs/input/input_flags.aconfig b/libs/input/input_flags.aconfig
index 0c850fe..174464d 100644
--- a/libs/input/input_flags.aconfig
+++ b/libs/input/input_flags.aconfig
@@ -26,6 +26,13 @@
   namespace: "input"
   description: "Set to true to enable timer support for the touchpad Gestures library"
   bug: "297192727"
+ }
+
+ flag {
+  name: "enable_input_event_tracing"
+  namespace: "input"
+  description: "Set to true to enable input event tracing, including always-on tracing on non-user builds"
+  bug: "210460522"
 }
 
 flag {