tools/idle_alloc: Only build in standalone builds.

Avoids compile errors in chromium (windows).

Change-Id: Ieb4d8f1ca742d123f31ac854f1f3d599a6ec204a
diff --git a/Android.bp b/Android.bp
index 79de486..e7f3d62 100644
--- a/Android.bp
+++ b/Android.bp
@@ -215,20 +215,6 @@
   ],
 }
 
-// GN target: //:idle_alloc
-cc_binary {
-  name: "idle_alloc",
-  srcs: [
-    "tools/idle_alloc.cc",
-  ],
-  shared_libs: [
-    "liblog",
-  ],
-  defaults: [
-    "perfetto_defaults",
-  ],
-}
-
 // GN target: //:libperfetto
 cc_library_shared {
   name: "libperfetto",
@@ -477,6 +463,7 @@
     "src/tracing/core/trace_stats.cc",
     "src/tracing/core/trace_writer_impl.cc",
     "src/tracing/core/tracing_service_impl.cc",
+    "src/tracing/core/tracing_service_state.cc",
     "src/tracing/core/virtual_destructors.cc",
     "src/tracing/data_source.cc",
     "src/tracing/internal/in_process_tracing_backend.cc",