Add HeadlessFocusClient to fix document.hasFocus() issues.

headless/lib/browser/headless_browser_impl.cc

 // Copyright 2015 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/lib/browser/headless_browser_impl.h"
 
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/memory/ptr_util.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "content/public/app/content_main.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/content_switches.h"
 #include "headless/lib/browser/headless_browser_context_impl.h"
 #include "headless/lib/browser/headless_browser_main_parts.h"
 #include "headless/lib/browser/headless_web_contents_impl.h"
 #include "headless/lib/headless_content_main_delegate.h"
 #include "ui/aura/env.h"
+#include "ui/aura/test/test_focus_client.h"
 #include "ui/aura/window.h"
 #include "ui/events/devices/device_data_manager.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace headless {
 namespace {
 
 int RunContentMain(
     HeadlessBrowser::Options options,
     const base::Callback<void(HeadlessBrowser*)>& on_browser_start_callback) {
   content::ContentMainParams params(nullptr);
   params.argc = options.argc;
   params.argv = options.argv;
 
   // TODO(skyostil): Implement custom message pumps.
   DCHECK(!options.message_pump);
 
   std::unique_ptr<HeadlessBrowserImpl> browser(
       new HeadlessBrowserImpl(on_browser_start_callback, std::move(options)));
   headless::HeadlessContentMainDelegate delegate(std::move(browser));
   params.delegate = &delegate;
   return content::ContentMain(params);
 }
 
 }  // namespace
 
 HeadlessBrowserImpl::HeadlessBrowserImpl(
     const base::Callback<void(HeadlessBrowser*)>& on_start_callback,
     HeadlessBrowser::Options options)
-    : on_start_callback_(on_start_callback),
+    : focus_client_(new aura::test::TestFocusClient()),

[Eric Seckler, 2017/02/22 09:00:04]

Let's get rid of the init here, since you reset it during
PlatformCreateWindow(). (Otherwise, it'd need to be inside an "#if
defined(USE_AURA)".)

[irisu, 2017/02/23 00:02:26]

Done.

+      on_start_callback_(on_start_callback),
       options_(std::move(options)),
       browser_main_parts_(nullptr),
       default_browser_context_(nullptr),
       weak_ptr_factory_(this) {}
 
 HeadlessBrowserImpl::~HeadlessBrowserImpl() {}
 
 HeadlessBrowserContext::Builder
 HeadlessBrowserImpl::CreateBrowserContextBuilder() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
@@ skipping 146 matching lines @@
 
   // Child processes should not end up here.
   DCHECK(!base::CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kProcessType));
 #endif
   return RunContentMain(std::move(options),
                         std::move(on_browser_start_callback));
 }
 
 }  // namespace headless