Add HeadlessFocusClient to fix document.hasFocus() issues.

headless/lib/browser/headless_browser_impl.h

 // 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.
 
 #ifndef HEADLESS_LIB_BROWSER_HEADLESS_BROWSER_IMPL_H_
 #define HEADLESS_LIB_BROWSER_HEADLESS_BROWSER_IMPL_H_
 
 #include "headless/public/headless_browser.h"
 
 #include <memory>
 #include <string>
 #include <unordered_map>
 #include <vector>
 
 #include "base/memory/weak_ptr.h"
 #include "content/public/browser/web_contents.h"
 #include "headless/lib/browser/headless_devtools_manager_delegate.h"
 #include "headless/lib/browser/headless_web_contents_impl.h"
 
 #if defined(USE_AURA)
 #include "headless/lib/browser/headless_window_tree_host.h"
+
+namespace aura {
+namespace client {
+class FocusClient;
+}
+}
 #endif
 
 namespace headless {
 
 class HeadlessBrowserContextImpl;
 class HeadlessBrowserMainParts;
 
 class HeadlessBrowserImpl : public HeadlessBrowser {
  public:
   HeadlessBrowserImpl(
@@ skipping 42 matching lines @@
   void PlatformCreateWindow();
   void PlatformInitializeWebContents(const gfx::Size& initial_size,
                                      content::WebContents* web_contents);
 
  protected:
 #if defined(USE_AURA)
   // TODO(eseckler): Currently one window and one window_tree_host
   // is used for all web contents. We should probably use one
   // window per web contents, but additional investigation is needed.
   std::unique_ptr<HeadlessWindowTreeHost> window_tree_host_;
+  std::unique_ptr<aura::client::FocusClient> focus_client_;
 #endif
+
   base::Callback<void(HeadlessBrowser*)> on_start_callback_;
   HeadlessBrowser::Options options_;
   HeadlessBrowserMainParts* browser_main_parts_;  // Not owned.
 
   std::unordered_map<std::string, std::unique_ptr<HeadlessBrowserContextImpl>>
       browser_contexts_;
   HeadlessBrowserContext* default_browser_context_;  // Not owned.
 
   base::WeakPtrFactory<HeadlessBrowserImpl> weak_ptr_factory_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(HeadlessBrowserImpl);
 };
 
 }  // namespace headless
 
 #endif  // HEADLESS_LIB_BROWSER_HEADLESS_BROWSER_IMPL_H_