Move viewport unit resolution to style recalc time

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 ad0bb2869e609b8788491cca67ffba4cc5635c31..2c6d9479d9a28fbf29b40852b045378f4605b97e 100644
--- a/Source/core/frame/FrameView.cpp
+++ b/Source/core/frame/FrameView.cpp
@@ -843,9 +843,11 @@ void FrameView::performPreLayoutTasks()
         m_inSynchronousPostLayout = false;
     }
 
-    // Viewport-dependent media queries may cause us to need completely different style information.
     Document* document = m_frame->document();
-    if (!document->styleResolverIfExists() || document->styleResolverIfExists()->affectedByViewportChange()) {
+    document->notifyResizeForViewportUnits();
+
+    // Viewport-dependent media queries may cause us to need completely different style information.
+    if (!document->styleResolverIfExists() || document->styleResolverIfExists()->mediaQueryAffectedByViewportChange()) {
         document->styleResolverChanged(RecalcStyleDeferred);
         document->mediaQueryAffectingValueChanged();