Add blink-side plumbing for ServiceWorker -> Document postMessage (1/3)

Source/web/FrameLoaderClientImpl.cpp

Index: Source/web/FrameLoaderClientImpl.cpp
diff --git a/Source/web/FrameLoaderClientImpl.cpp b/Source/web/FrameLoaderClientImpl.cpp
index 7c3b52d74e50761451e76c140d80d860ce16ee87..d687139032a69b61d358abbfc8e5b78efb30e786 100644
--- a/Source/web/FrameLoaderClientImpl.cpp
+++ b/Source/web/FrameLoaderClientImpl.cpp
@@ -57,6 +57,7 @@
 #include "modules/device_orientation/DeviceOrientationController.h"
 #include "modules/gamepad/NavigatorGamepad.h"
 #include "modules/screen_orientation/ScreenOrientationController.h"
+#include "modules/serviceworkers/NavigatorServiceWorker.h"
 #include "platform/MIMETypeRegistry.h"
 #include "platform/UserGestureIndicator.h"
 #include "platform/exported/WrappedResourceRequest.h"
@@ -127,6 +128,8 @@ void FrameLoaderClientImpl::dispatchDidClearWindowObjectInWorld(DOMWrapperWorld&
                 ScreenOrientationController::from(*document);
             if (RuntimeEnabledFeatures::gamepadEnabled())
                 NavigatorGamepad::from(*document);
+            if (RuntimeEnabledFeatures::serviceWorkerEnabled())
+                NavigatorServiceWorker::from(*document);
         }
     }
 }