Introduce NavigatorWebDriver interface

content/browser/renderer_host/render_view_host_impl.cc

Index: content/browser/renderer_host/render_view_host_impl.cc
diff --git a/content/browser/renderer_host/render_view_host_impl.cc b/content/browser/renderer_host/render_view_host_impl.cc
index 083e53b5c6842c9ea688b372458141dc20bf914d..f3a36e2f9127f94aa86ac285a1f94093119a6e0f 100644
--- a/content/browser/renderer_host/render_view_host_impl.cc
+++ b/content/browser/renderer_host/render_view_host_impl.cc
@@ -554,6 +554,10 @@ WebPreferences RenderViewHostImpl::ComputeWebkitPrefs() {
   if (delegate_ && delegate_->HasPersistentVideo())
     prefs.media_controls_enabled = false;
 
+  prefs.automation_controlled =
+      command_line.HasSwitch(switches::kEnableAutomation) ||
+      command_line.HasSwitch(switches::kHeadless);
+
   prefs.background_video_track_optimization_enabled =
       base::FeatureList::IsEnabled(media::kBackgroundVideoTrackOptimization);