Make sure to save/restore scroll positions in finishDelayUpdateScrollInfo

third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp

Index: third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp b/third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp
index d39e0314420a1617e4b77eb87ec06d7062d7d32e..12eb291bfba85466e56e178f7c82060e5b4bac9e 100644
--- a/third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutFlexibleBox.cpp
@@ -288,8 +288,13 @@ void LayoutFlexibleBox::layoutBlock(bool relayoutChildren)
 
         layoutFlexItems(relayoutChildren, layoutScope);
 
-        if (LayoutBlock::finishDelayUpdateScrollInfo(&layoutScope))
+        ScrollPositionMap scrollMap;
+        if (LayoutBlock::finishDelayUpdateScrollInfo(&layoutScope, &scrollMap)) {
             layoutFlexItems(false, layoutScope);
+            for (auto& entry : scrollMap) {
+                entry.key->scrollToPosition(entry.value);
+            }
+        }
 
         if (logicalHeight() != previousHeight)
             relayoutChildren = true;