Add apex structure and sign keys to appsearch.

This change adds image and container signing keys. please see go/android-apex-howto for detail.

Bug: 144874026
Test: manual
Change-Id: I6949043ae360bab44af34f12876721e7940c4338

apex/appsearch/Android.bp

@@ -0,0 +1,35 @@
+// 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.
+
+apex {
+    name: "com.android.appsearch",
+
+    manifest: "apex_manifest.json",
+
+    key: "com.android.appsearch.key",
+    certificate: ":com.android.appsearch.certificate",
+}
+
+apex_key {
+    name: "com.android.appsearch.key",
+    public_key: "com.android.appsearch.avbpubkey",
+    private_key: "com.android.appsearch.pem",
+}
+
+android_app_certificate {
+    name: "com.android.appsearch.certificate",
+    // This will use com.android.appsearch.x509.pem (the cert) and
+    // com.android.appsearch.pk8 (the private key)
+    certificate: "com.android.appsearch",
+}

apex/appsearch/apex_manifest.json

@@ -0,0 +1,4 @@
+{
+  "name": "com.android.appsearch",
+  "version": 1
+}

apex/appsearch/com.android.appsearch.pem

@@ -0,0 +1,51 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIJKQIBAAKCAgEAro9f/jvoIsj6ywuRmuUQS8UtprhohJitrovDMfm/T2R/WQvy
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+ancTvTn9lcBqECDMgq5DE/p96Oxg/t8elalR6WDUlysafphVz3nTuyMTh7ka
+-----END RSA PRIVATE KEY-----

apex/appsearch/com.android.appsearch.x509.pem

@@ -0,0 +1,35 @@
+-----BEGIN CERTIFICATE-----
+MIIGETCCA/mgAwIBAgIUGl+MIvpEi0+TWzj0ieh6WtjXmP8wDQYJKoZIhvcNAQEL
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+-----END CERTIFICATE-----