[adbwifi] Add adb protos.

BUG: b/111434128

Test: make
Change-Id: I7eef85c773e219e1873c9fbc30d14c17c110c3bf
diff --git a/adb/proto/pairing.proto b/adb/proto/pairing.proto
new file mode 100644
index 0000000..b0be20e
--- /dev/null
+++ b/adb/proto/pairing.proto
@@ -0,0 +1,30 @@
+/*
+ * 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.
+ */
+
+syntax = "proto3";
+
+option java_package = "com.android.server.adb.protos";
+option java_outer_classname = "PairingProto";
+
+package adb.proto;
+
+// The type of packets used in the pairing protocol
+message PairingPacket {
+    enum Type {
+        SPAKE2_MSG = 0;
+        PEER_INFO = 1;
+    }
+}