ApplicationStartInfo API Gating

Adds gating to new AppStartInfo APIs

Test: presubmit
Bug: 247814855
Change-Id: I3b8c027dc3cba0f264ea6b9733791b80699b210f
diff --git a/AconfigFlags.bp b/AconfigFlags.bp
index a271d06..09f50a8 100644
--- a/AconfigFlags.bp
+++ b/AconfigFlags.bp
@@ -36,6 +36,7 @@
     ":hwui_flags_java_lib{.generated_srcjars}",
     ":display_flags_lib{.generated_srcjars}",
     ":android.multiuser.flags-aconfig-java{.generated_srcjars}",
+    ":android.app.flags-aconfig-java{.generated_srcjars}",
 ]
 
 filegroup {
@@ -327,3 +328,16 @@
     aconfig_declarations: "android.multiuser.flags-aconfig",
     defaults: ["framework-minus-apex-aconfig-java-defaults"],
 }
+
+// Activity Manager
+aconfig_declarations {
+    name: "android.app.flags-aconfig",
+    package: "android.app",
+    srcs: ["core/java/android/app/activity_manager.aconfig"],
+}
+
+java_aconfig_library {
+    name: "android.app.flags-aconfig-java",
+    aconfig_declarations: "android.app.flags-aconfig",
+    defaults: ["framework-minus-apex-aconfig-java-defaults"],
+}