Bluetooth: Use enums for adapter connection states

Bug: 69478930
Test: make, no user visible change
Change-Id: I999d0c445fe3b24aca72961c40c3428901542bc1
diff --git a/stats/enums/bluetooth/enums.proto b/stats/enums/bluetooth/enums.proto
new file mode 100644
index 0000000..06ae2d3
--- /dev/null
+++ b/stats/enums/bluetooth/enums.proto
@@ -0,0 +1,30 @@
+/*
+ * Copyright 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.
+ */
+
+syntax = "proto2";
+package android.bluetooth;
+
+option java_outer_classname = "BluetoothProtoEnums";
+option java_multiple_files = true;
+
+// Bluetooth connection states.
+// Primarily used by android/bluetooth/BluetoothAdapter.java
+enum ConnectionStateEnum {
+  CONNECTION_STATE_DISCONNECTED = 0;
+  CONNECTION_STATE_CONNECTING = 1;
+  CONNECTION_STATE_CONNECTED = 2;
+  CONNECTION_STATE_DISCONNECTING = 3;
+}
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