Introduce NavigatorWebDriver interface

third_party/WebKit/LayoutTests/external/wpt/workers/interfaces.idl

Index: third_party/WebKit/LayoutTests/external/wpt/workers/interfaces.idl
diff --git a/third_party/WebKit/LayoutTests/external/wpt/workers/interfaces.idl b/third_party/WebKit/LayoutTests/external/wpt/workers/interfaces.idl
index 531a59cfbd2d938be2676a8d697a8b9d93000889..5e8aacdf21d0640926d612c18324a09538a55dc2 100644
--- a/third_party/WebKit/LayoutTests/external/wpt/workers/interfaces.idl
+++ b/third_party/WebKit/LayoutTests/external/wpt/workers/interfaces.idl
@@ -68,6 +68,7 @@ interface WorkerNavigator {};
 WorkerNavigator implements NavigatorID;
 WorkerNavigator implements NavigatorLanguage;
 WorkerNavigator implements NavigatorOnLine;
+WorkerNavigator implements NavigatorWebDriver;
 
 [NoInterfaceObject, Exposed=(Window,Worker)]
 interface NavigatorID {
@@ -90,6 +91,11 @@ interface NavigatorOnLine {
   readonly attribute boolean onLine;
 };
 
+[NoInterfaceObject, Exposed=(Window,Worker)]
+interface NavigatorWebDriver {
+  readonly attribute boolean webdriver;
+};
+
 [Exposed=Worker]
 interface WorkerLocation {
   stringifier readonly attribute USVString href;