Add java_defaults for @FlaggedApi handling

This CL is a preparation to ignore @FlaggedApi API in udc mainline
branch

Bug: 299411828
Test: TH
Change-Id: If3217916b2c37ebaa7b48d8387c69cb078af9550

Tethering/common/TetheringLib/Android.bp

@@ -21,6 +21,7 @@ java_sdk_library {
     name: "framework-tethering",
     defaults: [
         "framework-tethering-defaults",
+        "FlaggedApiDefaults",
     ],
     impl_library_visibility: [
         "//packages/modules/Connectivity/Tethering:__subpackages__",

framework-t/Android.bp

@@ -121,6 +121,7 @@ java_sdk_library {
     defaults: [
         "framework-connectivity-t-defaults",
         "enable-framework-connectivity-t-targets",
+        "FlaggedApiDefaults",
     ],
     api_srcs: framework_remoteauth_api_srcs,
     // Do not add static_libs to this library: put them in framework-connectivity instead.

framework/Android.bp

@@ -19,6 +19,15 @@ package {
     default_applicable_licenses: ["Android-Apache-2.0"],
 }
 
+// In the branch which does not support FlaggedAPI, use this default to ignore the annotated APIs.
+java_defaults {
+    name: "FlaggedApiDefaults",
+}
+
+// The above variables may have different values
+// depending on the branch, and this comment helps
+// separate them from the rest of the file to avoid merge conflicts
+
 filegroup {
     name: "framework-connectivity-internal-sources",
     srcs: [
@@ -152,6 +161,7 @@ java_sdk_library {
     defaults: [
         "framework-connectivity-defaults",
         "CronetJavaDefaults",
+        "FlaggedApiDefaults",
     ],
     installable: true,
     jarjar_rules: ":framework-connectivity-jarjar-rules",