Introduce NavigatorWebDriver interface

third_party/WebKit/Source/core/frame/Navigator.cpp

Index: third_party/WebKit/Source/core/frame/Navigator.cpp
diff --git a/third_party/WebKit/Source/core/frame/Navigator.cpp b/third_party/WebKit/Source/core/frame/Navigator.cpp
index 27ce6317f03466cf931450e820af2f6a60466e1b..5a49f43db1ba85293a4e97feae031d81b4c3ac2d 100644
--- a/third_party/WebKit/Source/core/frame/Navigator.cpp
+++ b/third_party/WebKit/Source/core/frame/Navigator.cpp
@@ -73,6 +73,17 @@ bool Navigator::cookieEnabled() const {
   return CookiesEnabled(GetFrame()->GetDocument());
 }
 
+bool Navigator::webdriver() const {
+  if (!GetFrame())
+    return false;
+
+  Settings* settings = GetFrame()->GetSettings();
+  if (!settings)
+    return false;
+
+  return settings->GetAutomationControlled() || settings->GetHeadless();
+}
+
 Vector<String> Navigator::languages() {
   Vector<String> languages;