arc: enable Android tracing in verified-boot mode

components/arc/common/trace.mojom

Index: components/arc/common/trace.mojom
diff --git a/components/arc/common/trace.mojom b/components/arc/common/trace.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..49574d29bd71355e9347b9bd54ed2e041733e2f8
--- /dev/null
+++ b/components/arc/common/trace.mojom
@@ -0,0 +1,16 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+module arc.mojom;
+
+interface TraceHost {
+};
+
+interface TraceInstance {
+  StartTracing@0(array<string> categories);
+
+  StopTracing@1();
+
+  QueryAvailableCategories@2() => (array<string> categories);
+};