Make createWindow (mostly) work with OOPIF

Source/web/PopupContainer.cpp

Index: Source/web/PopupContainer.cpp
diff --git a/Source/web/PopupContainer.cpp b/Source/web/PopupContainer.cpp
index 01bc2c8b875a85d107f1db65925528ee0034a094..1b218d0500d616aa642238b1240ca74bb7f38240 100644
--- a/Source/web/PopupContainer.cpp
+++ b/Source/web/PopupContainer.cpp
@@ -200,7 +200,10 @@ IntRect PopupContainer::layoutAndCalculateWidgetRect(int targetControlHeight, co
     IntRect widgetRectInScreen;
     // If the popup would extend past the bottom of the screen, open upwards
     // instead.
-    IntRect screen = screenAvailableRect(m_frameView.get());
+    Widget* rootWidget = m_frameView.get();
+    while (rootWidget->parent())
+        rootWidget = rootWidget->parent();
+    IntRect screen = rootWidget->hostWindow() ? screenAvailableRect(*rootWidget->hostWindow()) : IntRect();

[dcheng, 2015/05/04 17:38:11]

Does m_frameView->root() not work here?

     // Use popupInitialCoordinate.x() + rightOffset because RTL position
     // needs to be considered.
     float pageScaleFactor = m_frameView->frame().page()->pageScaleFactor();