Switch android.test and junit classes to use UnsupportedAppUsage

The UnsupportedAppUsage annotations could not be added directly to the
java files in src/ as they have to be built against the current api
which does not include the annotation. Instead this uses the same
technique as used for libcore/ojluni files and adds the annotations to
stub files (in hiddenapi/src) which are built as part of the
android.test.base-hiddenapi target. That target is added to a special
whitelist in build/soong/java/config/config.go which causes the
hiddenapi information to be extracted from the target.

Also, updates the preupload check to prevent anymore entries being
added to the config/hiddenapi-greylist.txt for android.test or junit
classes.

Bug: 73711752
Test: m cts-hiddenapi_flags-csv and check that it contained the
        correct entries even though they had been removed from
	config/hiddenapi-greylist.txt
Change-Id: Ifaf15d2751f54cb03f8402b866a0ee4da7acc4d2
diff --git a/test-base/hiddenapi/Android.bp b/test-base/hiddenapi/Android.bp
new file mode 100644
index 0000000..c4e0fab
--- /dev/null
+++ b/test-base/hiddenapi/Android.bp
@@ -0,0 +1,29 @@
+//
+// Copyright (C) 2019 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+// Provided solely to contribute information about which hidden parts of the android.test.base
+// library are used by apps. The source files are stubs of the actual files in ../src which use the
+// UnsupportedAppUsage annotation to tag those methods that are accessible via the hiddenapi.
+// Relies on the convention that modules with name <x>-hiddenapi provide hiddenapi information for
+// module <x> that is on the bootclasspath.
+java_library {
+    name: "android.test.base-hiddenapi",
+    compile_dex: true,
+
+    srcs: ["src/**/*.java"],
+
+    libs: ["android.test.base"],
+}