Trigger style recalc when the window's active state change

Source/core/editing/FrameSelection.cpp

Index: Source/core/editing/FrameSelection.cpp
diff --git a/Source/core/editing/FrameSelection.cpp b/Source/core/editing/FrameSelection.cpp
index b2948ef0d254de143ce815d6e4c9383fec615569..91434f7b6572eae154c737b6a3a7b859aacbda81 100644
--- a/Source/core/editing/FrameSelection.cpp
+++ b/Source/core/editing/FrameSelection.cpp
@@ -1466,6 +1466,11 @@ void FrameSelection::focusedOrActiveStateChanged()
     RefPtrWillBeRawPtr<Document> document = m_frame->document();
     document->updateRenderTreeIfNeeded();
 
+    // Invalidate All CustomScrollbars as CustomScrollbars supports
+    // CSS window-active attribute.
+    if (FrameView* view = document->view())
+        view->invalidateAllCustomScrollbarsOnActiveChanged();

[pdr., 2014/12/06 04:17:53]

Should this be here or in pageActivationChanged?

[MuVen, 2014/12/06 13:27:03]

I think its better to be here, as all window-inactive 
invalidations can be at one place.
(TextSelection on window-inactive: invalidatePaintForSelection.)
let me know if you want this to be place at another place.

+
     // Because RenderObject::selectionBackgroundColor() and
     // RenderObject::selectionForegroundColor() check if the frame is active,
     // we have to update places those colors were painted.