Implement broadcast radio announcements.

Bug: 68045105
Test: VTS
Change-Id: I14d394862ec34d63218c938779e217c28710e230
diff --git a/broadcastradio/2.0/ICloseHandle.hal b/broadcastradio/2.0/ICloseHandle.hal
new file mode 100644
index 0000000..34cea14
--- /dev/null
+++ b/broadcastradio/2.0/ICloseHandle.hal
@@ -0,0 +1,32 @@
+/* Copyright (C) 2017 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.
+ */
+
+package android.hardware.broadcastradio@2.0;
+
+/**
+ * Represents a generic close handle to remove a callback that doesn't need
+ * active interface.
+ */
+interface ICloseHandle {
+    /**
+     * Closes the handle.
+     *
+     * The call must not fail and must only be issued once.
+     *
+     * After the close call is executed, no other calls to this interface
+     * are allowed.
+     */
+    close();
+};