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.bp

@@ -7,3 +7,8 @@ filegroup {
     name: "IDropBoxManagerService.aidl",
     srcs: ["com/android/internal/os/IDropBoxManagerService.aidl"],
 }
+
+filegroup {
+    name: "ITracingServiceProxy.aidl",
+    srcs: ["android/tracing/ITracingServiceProxy.aidl"],
+}