arc: enable Android tracing in verified-boot mode

chromeos/dbus/dbus_thread_manager.h

Index: chromeos/dbus/dbus_thread_manager.h
diff --git a/chromeos/dbus/dbus_thread_manager.h b/chromeos/dbus/dbus_thread_manager.h
index e8b1287229ad00250b4ac81ee44c63cef493c16a..d69d7af19e6da5521e6d0b69cf765f4f1b161804 100644
--- a/chromeos/dbus/dbus_thread_manager.h
+++ b/chromeos/dbus/dbus_thread_manager.h
@@ -25,6 +25,7 @@ namespace chromeos {
 
 // Style Note: Clients are sorted by names.
 class ArcObbMounterClient;
+class ArcTraceAgent;
 class AuthPolicyClient;
 class CrasAudioClient;
 class CrosDisksClient;
@@ -119,6 +120,7 @@ class CHROMEOS_EXPORT DBusThreadManager {
   // TODO(jamescook): Replace this with calls to FooClient::Get().
   // http://crbug.com/647367
   ArcObbMounterClient* GetArcObbMounterClient();
+  ArcTraceAgent* GetArcTraceAgent();
   AuthPolicyClient* GetAuthPolicyClient();
   CrasAudioClient* GetCrasAudioClient();
   CrosDisksClient* GetCrosDisksClient();