Introduce TracingServiceProxy System Services

Introduces a new SystemService to act as intermediary between the
Perfetto trace daemon and Traceur.

Bug: 175591887
Test: adb shell service call 1 i32 0/1

Change-Id: Idea7761a8479827f0cfa561e56ba2beac3072939

core/java/android/tracing/ITracingServiceProxy.aidl

@@ -0,0 +1,32 @@
+/**
+ * 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.
+ */
+
+package android.tracing;
+
+/**
+ * Binder interface for the TracingServiceProxy running in system_server.
+ *
+ * {@hide}
+ */
+interface ITracingServiceProxy
+{
+    /**
+     * Notifies system tracing app that a tracing session has ended. If a session is repurposed
+     * for use in a bugreport, sessionStolen can be set to indicate that tracing has ended but
+     * there is no buffer available to dump.
+     */
+    oneway void notifyTraceSessionEnded(boolean sessionStolen);
+}

core/java/android/tracing/OWNERS

@@ -0,0 +1,2 @@
+cfijalkovich@google.com
+carmenjackson@google.com