Set up the jarjar config generator for the Tethering module.

This does not affect existing classes in framework-tethering.jar
as everything inside android.net is excluded from being jarjar'ed.
It is a preparatory step to adding cronet to framework-tethering.jar
which will use jarjar.

Test: m
Change-Id: I8cc7babaa37f7aef52306a833593dba097fd26db

Tethering/common/TetheringLib/Android.bp

@@ -31,7 +31,7 @@ cronet_java_prejarjar_defaults = "CronetJavaPrejarjarDefaultsEnabled"
 
 java_sdk_library {
     name: "framework-tethering",
-    defaults: ["framework-module-defaults"],
+    defaults: ["framework-tethering-defaults"],
     impl_library_visibility: [
         "//packages/modules/Connectivity/Tethering:__subpackages__",
         "//packages/modules/Connectivity/framework",
@@ -57,24 +57,54 @@ java_sdk_library {
         "//packages/modules/NetworkStack/tests:__subpackages__",
         "//packages/modules/Wifi/service/tests/wifitests",
     ],
+    stub_only_libs: ["framework-connectivity.stubs.module_lib"],
+
+    jarjar_rules: ":framework-tethering-jarjar-rules",
+    installable: true,
 
-    srcs: [":framework-tethering-srcs"],
+    hostdex: true, // for hiddenapi check
+    permitted_packages: ["android.net"],
+    lint: { strict_updatability_linting: true },
+}
+
+java_library {
+  name: "framework-tethering-pre-jarjar",
+  defaults: ["framework-tethering-defaults"],
+}
+
+java_genrule {
+    name: "framework-tethering-jarjar-rules",
+    tool_files: [
+        ":framework-tethering-pre-jarjar{.jar}",
+        ":framework-tethering.stubs.module_lib{.jar}",
+        "jarjar-excludes.txt",
+    ],
+    tools: [
+        "jarjar-rules-generator",
+    ],
+    out: ["framework_tethering_jarjar_rules.txt"],
+    cmd: "$(location jarjar-rules-generator) " +
+        "$(location :framework-tethering-pre-jarjar{.jar}) " +
+        "--apistubs $(location :framework-tethering.stubs.module_lib{.jar}) " + 
+        "--prefix android.net.http.internal " +
+        "--excludes $(location jarjar-excludes.txt) " +
+        "--output $(out)",
+}
+
+java_defaults {
+    name: "framework-tethering-defaults",
+    defaults: ["framework-module-defaults"],
+    srcs: [
+      ":framework-tethering-srcs"
+    ],
     libs: ["framework-connectivity.stubs.module_lib"],
-    stub_only_libs: ["framework-connectivity.stubs.module_lib"],
     aidl: {
         include_dirs: [
             "packages/modules/Connectivity/framework/aidl-export",
         ],
     },
-
-    jarjar_rules: "jarjar-rules.txt",
-    installable: true,
-
-    hostdex: true, // for hiddenapi check
     apex_available: ["com.android.tethering"],
-    permitted_packages: ["android.net"],
     min_sdk_version: "30",
-    lint: { strict_updatability_linting: true },
 }
 
 filegroup {

Tethering/common/TetheringLib/jarjar-excludes.txt

+# Don't touch anything that's already under android.net
+android\.net\..+
\ No newline at end of file

Tethering/common/TetheringLib/jarjar-rules.txt

-# jarjar rules for the bootclasspath tethering framework library here
\ No newline at end of file