android: Java-based launcher thread

base/test/android/java_handler_thread_for_testing.h

Index: base/test/android/java_handler_thread_for_testing.h
diff --git a/base/test/android/java_handler_thread_for_testing.h b/base/test/android/java_handler_thread_for_testing.h
index bb3bb98cfea945018e00d66d9e1546ea4a16073d..082052c600077cba5ae8e797919ed72f02d840f5 100644
--- a/base/test/android/java_handler_thread_for_testing.h
+++ b/base/test/android/java_handler_thread_for_testing.h
@@ -38,6 +38,8 @@ class JavaHandlerThreadForTesting : public JavaHandlerThread {
  public:
   JavaHandlerThreadForTesting(const char* name,
                               base::WaitableEvent* test_done_event);
+  // Create java peer first, then connect with native.
+  explicit JavaHandlerThreadForTesting(base::WaitableEvent* test_done_event);
   ~JavaHandlerThreadForTesting() override;
 
   void StartMessageLoop() override;