EDK: Add a TestIOThread::IsCurrentAndRunning().

mojo/edk/system/test/test_io_thread.cc

Index: mojo/edk/system/test/test_io_thread.cc
diff --git a/mojo/edk/system/test/test_io_thread.cc b/mojo/edk/system/test/test_io_thread.cc
index 9dcc873d5c5907ec536b9e972a5c4fe2cd70baa6..eaa218a9fa06707598ce8b204e02e4610e76cf06 100644
--- a/mojo/edk/system/test/test_io_thread.cc
+++ b/mojo/edk/system/test/test_io_thread.cc
@@ -55,6 +55,11 @@ void TestIOThread::Stop() {
   io_thread_started_ = false;
 }
 
+bool TestIOThread::IsCurrentAndRunning() const {
+  return base::MessageLoop::current() == io_thread_.message_loop() &&
+         io_thread_.message_loop()->is_running();
+}
+
 void TestIOThread::PostTask(const base::Closure& task) {
   io_task_runner_->PostTask(task);
 }