Create test-legacy/ for android.test.legacy target

The android.test.legacy (and legacy-android-test) target depends on
code from both test-base/ and test-runner/ and do not really belong
in either folder.

Having a separate folder will also provide a convenient place for
the artifacts needed to publish android.test.legacy to
maven.google.com.

Bug: 30188076
Test: make checkbuild
Change-Id: Ied54c24694b3167fcf9075a3157e92ec53b8f636
diff --git a/test-legacy/Android.mk b/test-legacy/Android.mk
new file mode 100644
index 0000000..b8c5326
--- /dev/null
+++ b/test-legacy/Android.mk
@@ -0,0 +1,40 @@
+#
+# Copyright (C) 2018 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.
+#
+
+LOCAL_PATH:= $(call my-dir)
+
+# For unbundled build we'll use the prebuilt jar from prebuilts/sdk.
+ifeq (,$(TARGET_BUILD_APPS)$(filter true,$(TARGET_BUILD_PDK)))
+
+# Build the android.test.legacy library
+# =====================================
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := android.test.legacy
+
+LOCAL_SDK_VERSION := current
+
+LOCAL_JAVA_LIBRARIES := junit
+LOCAL_STATIC_JAVA_LIBRARIES := \
+    android.test.base-minus-junit \
+    android.test.runner-minus-junit \
+
+include $(BUILD_STATIC_JAVA_LIBRARY)
+
+# Archive a copy of the classes.jar in SDK build.
+$(call dist-for-goals,sdk win_sdk,$(full_classes_jar):android.test.legacy.jar)
+
+endif  # not TARGET_BUILD_APPS not TARGET_BUILD_PDK=true