arc: enable Android tracing in verified-boot mode

chromeos/dbus/dbus_thread_manager.cc

Index: chromeos/dbus/dbus_thread_manager.cc
diff --git a/chromeos/dbus/dbus_thread_manager.cc b/chromeos/dbus/dbus_thread_manager.cc
index f54dfe5dc7e7843ecbac38904cb1d7f24e2b940f..6b79dd8807d3beda8effeaa5f035ff4915943648 100644
--- a/chromeos/dbus/dbus_thread_manager.cc
+++ b/chromeos/dbus/dbus_thread_manager.cc
@@ -12,6 +12,7 @@
 #include "base/threading/thread.h"
 #include "chromeos/chromeos_switches.h"
 #include "chromeos/dbus/arc_obb_mounter_client.h"
+#include "chromeos/dbus/arc_trace_agent.h"
 #include "chromeos/dbus/auth_policy_client.h"
 #include "chromeos/dbus/cras_audio_client.h"
 #include "chromeos/dbus/cros_disks_client.h"
@@ -111,6 +112,10 @@ ArcObbMounterClient* DBusThreadManager::GetArcObbMounterClient() {
                           : nullptr;
 }
 
+ArcTraceAgent* DBusThreadManager::GetArcTraceAgent() {
+  return clients_browser_ ? clients_browser_->arc_trace_agent_.get() : nullptr;
+}
+
 AuthPolicyClient* DBusThreadManager::GetAuthPolicyClient() {
   return clients_browser_ ? clients_browser_->auth_policy_client_.get()
                           : nullptr;