Reland "Recompute overflow after transform changes"

Source/core/frame/FrameView.cpp

Index: Source/core/frame/FrameView.cpp
diff --git a/Source/core/frame/FrameView.cpp b/Source/core/frame/FrameView.cpp
index af390ad8c9c7110e4fffca30a13e4adbfb81f5f4..158285795c125d4e7a301ff0a4699e72c34b2490 100644
--- a/Source/core/frame/FrameView.cpp
+++ b/Source/core/frame/FrameView.cpp
@@ -616,6 +616,19 @@ void FrameView::updateAcceleratedCompositingSettings()
         renderView->compositor()->updateAcceleratedCompositingSettings();
 }
 
+void FrameView::recalcOverflowAfterStyleChange()
+{
+    RenderView* renderView = this->renderView();
+    ASSERT(renderView);
+    if (!renderView->needsOverflowRecalcAfterStyleChange())
+        return;
+
+    renderView->recalcOverflowAfterStyleChange();
+
+    // FIXME: We should adjust frame scrollbar here, but that will make many
+    // tests flake in debug build.
+}
+
 void FrameView::updateCompositingLayersAfterStyleChange()
 {
     RenderView* renderView = this->renderView();