binding: Calls didAccessInitialDocument() for a returned Window.

third_party/WebKit/Source/bindings/core/v8/custom/V8WindowCustom.cpp

Index: third_party/WebKit/Source/bindings/core/v8/custom/V8WindowCustom.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/custom/V8WindowCustom.cpp b/third_party/WebKit/Source/bindings/core/v8/custom/V8WindowCustom.cpp
index 4725c465cadedac1acd56151d22cfb18d2c251b2..28ab101a3466e84e954595e2a40c3f7b9a4020c5 100644
--- a/third_party/WebKit/Source/bindings/core/v8/custom/V8WindowCustom.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/custom/V8WindowCustom.cpp
@@ -244,6 +244,16 @@ void V8Window::openMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
     if (!openedWindow)
         return;
 
+    if (openedWindow->isLocalDOMWindow()) {
+        LocalFrame* targetFrame = toLocalDOMWindow(openedWindow)->frame();
+        if (targetFrame) {
+            // Notify the loader's client if the initial document has been accessed.
+            if (targetFrame->loader().stateMachine()->isDisplayingInitialEmptyDocument()) {
+                targetFrame->loader().didAccessInitialDocument();
+            }
+        }
+    }
+
     v8SetReturnValueFast(info, openedWindow, impl);
 }