Trigger style recalc when the window's active state change

Source/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 323 matching lines @@
         m_verticalScrollbar->styleChanged();
         didStyleChange = true;
     }
     if (didStyleChange) {
         updateScrollbarGeometry();
         updateScrollCorner();
         positionScrollbarLayers();
     }
 }
 
+void FrameView::invalidateAllCustomScrollbarsOnActiveChanged()
+{
+    const ChildrenWidgetSet* viewChildren = children();
+    for (const RefPtrWillBeMember<Widget>& child : *viewChildren) {
+        Widget* widget = child.get();
+        if (widget->isFrameView()) {
+            toFrameView(widget)->recalculateCustomScrollbarStyle();
+            toFrameView(widget)->invalidateAllCustomScrollbarsOnActiveChanged();

[skobes, 2014/12/08 21:48:04]

Sorry to revisit this but I am still confused by the recursive descent.  Doesn't
the iframe have its own FrameSelection object?  Is there some reason we would
get FrameSelection::focusedOrActiveStateChanged() only for the topmost frame?

[MuVen, 2014/12/09 09:33:07]

Actually as i see there is an issue in the FrameSelection even. I have raised
issue for the same @ crbug.com/440313. Only focused element shouldnt be
invalidated. window-inactive css needs to be applied for all the elements with
in the document which has window-inactive css.

+        } else if (widget->isScrollbar()) {
+            toScrollbar(widget)->styleChanged();
+        }
+    }
+}
+
 void FrameView::recalculateScrollbarOverlayStyle()
 {
     ScrollbarOverlayStyle oldOverlayStyle = scrollbarOverlayStyle();
     ScrollbarOverlayStyle overlayStyle = ScrollbarOverlayStyleDefault;
 
     Color backgroundColor = documentBackgroundColor();
     // Reduce the background color from RGB to a lightness value
     // and determine which scrollbar style to use based on a lightness
     // heuristic.
     double hue, saturation, lightness;
@@ skipping 3608 matching lines @@
         return;
 
     ScrollableArea::setScrollOrigin(origin);
 
     // Update if the scroll origin changes, since our position will be different if the content size did not change.
     if (updatePositionAtAll && updatePositionSynchronously)
         updateScrollbars(scrollOffsetDouble());
 }
 
 } // namespace blink