Index: third_party/WebKit/Source/platform/scroll/ScrollableArea.cpp |
diff --git a/third_party/WebKit/Source/platform/scroll/ScrollableArea.cpp b/third_party/WebKit/Source/platform/scroll/ScrollableArea.cpp |
index 1b86c474a95c10e9d90eb9250183cd5ff7e15404..fd9970a15621e85d29b885d7b9e72c8ed9ba7acb 100644 |
--- a/third_party/WebKit/Source/platform/scroll/ScrollableArea.cpp |
+++ b/third_party/WebKit/Source/platform/scroll/ScrollableArea.cpp |
@@ -244,19 +244,14 @@ void ScrollableArea::scrollPositionChanged(const DoublePoint& position, ScrollTy |
// Tell the derived class to scroll its contents. |
setScrollOffset(truncatedPosition, scrollType); |
- Scrollbar* verticalScrollbar = this->verticalScrollbar(); |
- |
// Tell the scrollbars to update their thumb postions. |
- if (Scrollbar* horizontalScrollbar = this->horizontalScrollbar()) { |
+ // If the scrollbar does not have its own layer, it must always be |
+ // invalidated to reflect the new thumb position, even if the theme did not |
+ // invalidate any individual part. |
+ if (Scrollbar* horizontalScrollbar = this->horizontalScrollbar()) |
horizontalScrollbar->offsetDidChange(); |
- if (horizontalScrollbar->isOverlayScrollbar() && !hasLayerForHorizontalScrollbar()) |
- setScrollbarNeedsPaintInvalidation(HorizontalScrollbar); |
- } |
- if (verticalScrollbar) { |
+ if (Scrollbar* verticalScrollbar = this->verticalScrollbar()) |
verticalScrollbar->offsetDidChange(); |
- if (verticalScrollbar->isOverlayScrollbar() && !hasLayerForVerticalScrollbar()) |
- setScrollbarNeedsPaintInvalidation(VerticalScrollbar); |
- } |
if (scrollPositionDouble() != oldPosition) { |
// FIXME: Pass in DoubleSize. crbug.com/414283. |