Add --headless flag to Windows

headless/test/headless_browser_test.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "headless/test/headless_browser_test.h"
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 193 matching lines @@
   web_contents_->GetDevToolsTarget()->AttachClient(devtools_client_.get());
   RunDevTooledTest();
 }
 
 void HeadlessAsyncDevTooledBrowserTest::RenderProcessExited(
     base::TerminationStatus status,
     int exit_code) {
   if (status == base::TERMINATION_STATUS_NORMAL_TERMINATION)
     return;
 
-  FAIL() << "Abnormal renderer termination";
   FinishAsynchronousTest();
   render_process_exited_ = true;
+  FAIL() << "Abnormal renderer termination";
 }
 
 void HeadlessAsyncDevTooledBrowserTest::RunTest() {
   HeadlessBrowserContext::Builder builder =
       browser()->CreateBrowserContextBuilder();
   builder.SetProtocolHandlers(GetProtocolHandlers());
   if (GetCreateTabSocket()) {
     builder.EnableUnsafeNetworkAccessWithMojoBindings(true);
     builder.AddTabSocketMojoBindings();
   }
@@ skipping 19 matching lines @@
 
 ProtocolHandlerMap HeadlessAsyncDevTooledBrowserTest::GetProtocolHandlers() {
   return ProtocolHandlerMap();
 }
 
 bool HeadlessAsyncDevTooledBrowserTest::GetCreateTabSocket() {
   return false;
 }
 
 }  // namespace headless