Test ExistingThreadLoader.

content/utility/utility_process_control_impl.h

Index: content/utility/utility_process_control_impl.h
diff --git a/content/utility/utility_process_control_impl.h b/content/utility/utility_process_control_impl.h
index 9d450fd2fda5496527f242581439ed3c72a55be8..004e9db0a4f24e96e258810a0049b3dcb0a2ff36 100644
--- a/content/utility/utility_process_control_impl.h
+++ b/content/utility/utility_process_control_impl.h
@@ -6,6 +6,7 @@
 #define CONTENT_UTILITY_UTILITY_PROCESS_CONTROL_IMPL_H_
 
 #include "base/macros.h"
+#include "base/threading/thread.h"
 #include "content/child/process_control_impl.h"
 
 namespace content {
@@ -23,6 +24,8 @@ class UtilityProcessControlImpl : public ProcessControlImpl {
  private:
   void OnLoadFailed() override;
 
+  base::Thread test_thread_;
+
   DISALLOW_COPY_AND_ASSIGN(UtilityProcessControlImpl);
 };