Add aconfig flag enable_launcher_br_metrics

Flag: ACONFIG  com.android.launcher3.enable_launcher_br_metrics DEVELOPMENT
Bug: 307527314
Bug: 305984208
Test: locally verify
Change-Id: I28488de7133d898e6ef990183f0af5f34732cced
diff --git a/aconfig/launcher.aconfig b/aconfig/launcher.aconfig
index 5689c8a..760d8ac 100644
--- a/aconfig/launcher.aconfig
+++ b/aconfig/launcher.aconfig
@@ -69,3 +69,10 @@
     description: "Enables initiating split from a fullscreen app using keyboard shortcuts"
     bug: "270394122"
 }
+
+flag {
+    name: "enable_launcher_br_metrics"
+    namespace: "launcher"
+    description: "Enables logging of Launcher restore metrics to the Backup & Restore team"
+    bug: "307527314"
+}