Invalidate scrollbars when window activity changes if needed

third_party/WebKit/Source/core/frame/FrameView.cpp

Index: third_party/WebKit/Source/core/frame/FrameView.cpp
diff --git a/third_party/WebKit/Source/core/frame/FrameView.cpp b/third_party/WebKit/Source/core/frame/FrameView.cpp
index 4fa3a37d883248119a6202fce3a1ee4b29b922ab..971d9a663bdb4b09d786b55d02ebc7464a386ae0 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.cpp
+++ b/third_party/WebKit/Source/core/frame/FrameView.cpp
@@ -346,6 +346,8 @@ void FrameView::invalidateAllCustomScrollbarsOnActiveChanged()
             toFrameView(widget)->invalidateAllCustomScrollbarsOnActiveChanged();
         else if (usesWindowInactiveSelector && widget->isScrollbar() && toScrollbar(widget)->isCustomScrollbar())
             toScrollbar(widget)->styleChanged();
+        if (widget->isScrollbar())
+            toScrollbar(widget)->windowActiveChangedForSnowLeopardOnly();
     }
     if (usesWindowInactiveSelector)
         recalculateCustomScrollbarStyle();