Add CDM dependency in Tethering

This change introduces a limited library for dependencies on
framework-connectivity from Tethering,
connectivity-internal-api-util, where all classes are annotated with
@RequiresApi(S) to ensure proper API checks are done before usage.

Bug: 245972418

Change-Id: I82bafd9063341adc71d07f0858e6d68283d081f0
diff --git a/framework/Android.bp b/framework/Android.bp
index 485961c..3950dba 100644
--- a/framework/Android.bp
+++ b/framework/Android.bp
@@ -80,7 +80,9 @@
         "framework-connectivity-t.stubs.module_lib",
     ],
     impl_only_libs: [
-        "framework-tethering.stubs.module_lib",
+        // TODO: figure out why just using "framework-tethering" uses the stubs, even though both
+        // framework-connectivity and framework-tethering are in the same APEX.
+        "framework-tethering.impl",
         "framework-wifi.stubs.module_lib",
         "net-utils-device-common",
     ],
@@ -109,9 +111,9 @@
     libs: [
         // This cannot be in the defaults clause above because if it were, it would be used
         // to generate the connectivity stubs. That would create a circular dependency
-        // because the tethering stubs depend on the connectivity stubs (e.g.,
+        // because the tethering impl depend on the connectivity stubs (e.g.,
         // TetheringRequest depends on LinkAddress).
-        "framework-tethering.stubs.module_lib",
+        "framework-tethering.impl",
         "framework-wifi.stubs.module_lib",
     ],
     visibility: ["//packages/modules/Connectivity:__subpackages__"]
@@ -243,3 +245,24 @@
         "//packages/modules/Connectivity/service",
     ],
 }
+
+// Library providing limited APIs within the connectivity module, so that R+ components like
+// Tethering have a controlled way to depend on newer components like framework-connectivity that
+// are not loaded on R.
+java_library {
+    name: "connectivity-internal-api-util",
+    sdk_version: "module_current",
+    libs: [
+        "androidx.annotation_annotation",
+        "framework-connectivity.impl",
+    ],
+    jarjar_rules: ":framework-connectivity-jarjar-rules",
+    srcs: [
+        // Files listed here MUST all be annotated with @RequiresApi(Build.VERSION_CODES.TIRAMISU),
+        // so that API checks are enforced for R+ users of this library
+        "src/android/net/connectivity/TiramisuConnectivityInternalApiUtil.java",
+    ],
+    visibility: [
+        "//packages/modules/Connectivity/Tethering:__subpackages__",
+    ],
+}