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/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
@@ skipping 190 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() {
   browser_context_ = browser()
                          ->CreateBrowserContextBuilder()
                          .SetProtocolHandlers(GetProtocolHandlers())
                          .Build();
   browser()->SetDefaultBrowserContext(browser_context_);
 
   web_contents_ = browser_context_->CreateWebContentsBuilder().Build();
   web_contents_->AddObserver(this);
 
   RunAsynchronousTest();
 
   if (!render_process_exited_)
     web_contents_->GetDevToolsTarget()->DetachClient(devtools_client_.get());
   web_contents_->RemoveObserver(this);
   web_contents_->Close();
   web_contents_ = nullptr;
   browser_context_->Close();
   browser_context_ = nullptr;
 }
 
 ProtocolHandlerMap HeadlessAsyncDevTooledBrowserTest::GetProtocolHandlers() {
   return ProtocolHandlerMap();
 }
 
 }  // namespace headless