Add api_surface prop to non-updatable droidstubs

All droidstubs created from sdk_library possess api_surface information,
while the non-updatable droidstubs do not define this property. This
change defines api_surface for non-updatable droidstubs so that the
information can be used in java_api_library

Test: m nothing
Bug: 301321012
Change-Id: I6c08003bb8c366f331440e52bbde776999fd6c94
diff --git a/api/StubLibraries.bp b/api/StubLibraries.bp
index ba11ded..f2fe205 100644
--- a/api/StubLibraries.bp
+++ b/api/StubLibraries.bp
@@ -63,6 +63,7 @@
             tag: ".removed-api.txt",
         },
     ],
+    api_surface: "public",
 }
 
 priv_apps = " --show-annotation android.annotation.SystemApi\\(" +
@@ -116,6 +117,7 @@
             tag: ".removed-api.txt",
         },
     ],
+    api_surface: "system",
 }
 
 droidstubs {
@@ -161,6 +163,7 @@
             tag: ".removed-api.txt",
         },
     ],
+    api_surface: "test",
 }
 
 droidstubs {
@@ -200,6 +203,7 @@
             tag: ".removed-api.txt",
         },
     ],
+    api_surface: "module-lib",
 }
 
 /////////////////////////////////////////////////////////////////////
diff --git a/services/Android.bp b/services/Android.bp
index eb56c25..5b15392f 100644
--- a/services/Android.bp
+++ b/services/Android.bp
@@ -255,4 +255,5 @@
             tag: ".removed-api.txt",
         },
     ],
+    api_surface: "system-server",
 }