Convert Android.mk to Android.bp

This CL builds the Widevine drm services and libraries.
Soong makefile conversion for unit and integration
tests will be in a different CL.

This doc may help with the review:
https://docs.google.com/document/d/1lK3X9RFPwbbwewLNlS4TfSMhxIlPuAkHRnGcgwWpChU/edit?usp=sharing

Test: build
Test: Play Movies and Netflix streaming
Test: unit tests
  build_and_run_all_tests.sh
Test: gts
  ANDROID_BUILD_TOP= ./android-gts/tools/gts-tradefed run gts -m GtsMediaTestCases -t com.google.android.media.gts.MediaDrmTest

  atest GtsExoPlayerTestCases:com.google.android.exoplayer.gts.DashTest

Test: vts
  ANDROID_BUILD_TOP= PATH="$PWD/android-vts/tools:$PATH" vts-tradefed run commandAndExit vts --module VtsHalDrmV1_3Target

Bug: 162321744
Change-Id: I50c0fb2e8f28dfe7901587e3d3203542943e23b1

libwvdrmengine/cdm/core/test/Android.bp

@@ -0,0 +1,22 @@
+// Copyright (C) 2020 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.
+
+filegroup {
+    name: "vts_cdm_core_test_srcs",
+    srcs: [
+        "url_request.cpp",
+        "license_request.cpp",
+        "http_socket.cpp",
+    ],
+}