Add HeadlessFocusClient to fix document.hasFocus() issues.

headless/lib/browser/headless_browser_impl.h

Index: headless/lib/browser/headless_browser_impl.h
diff --git a/headless/lib/browser/headless_browser_impl.h b/headless/lib/browser/headless_browser_impl.h
index e622227f65b5f0e13e89224f3cf8d7fa4dc6338b..fbcdb1869b4f648180ca7b54324e95b2af0f3e80 100644
--- a/headless/lib/browser/headless_browser_impl.h
+++ b/headless/lib/browser/headless_browser_impl.h
@@ -21,6 +21,12 @@
 #include "headless/lib/browser/headless_window_tree_host.h"
 #endif
 
+namespace aura {

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

nit: let's move this into the "#if defined(USE_AURA)" section above.

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

Done.

+namespace client {
+class FocusClient;
+}
+}
+
 namespace headless {
 
 class HeadlessBrowserContextImpl;
@@ -81,6 +87,8 @@ class HeadlessBrowserImpl : public HeadlessBrowser {
   // 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_;
+

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

nit: move blank line after "#endif"

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

Done.

 #endif
   base::Callback<void(HeadlessBrowser*)> on_start_callback_;
   HeadlessBrowser::Options options_;