Update PaintLayer size during layout, not after.

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

Index: third_party/WebKit/Source/core/layout/LayoutBox.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBox.cpp b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
index e8af5243d7eb00bbb6cdc56dbf5ff7536733344d..49d7fddc0d1528e312f8b3162982590f50dfb0cb 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBox.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
@@ -751,7 +751,7 @@ void LayoutBox::UpdateAfterLayout() {
   // transform after layout.
   if (HasLayer()) {
     Layer()->UpdateTransformationMatrix();
-    Layer()->UpdateScrollingAfterLayout();
+    Layer()->UpdateSizeAndScrollingAfterLayout();
   }
 }
 
@@ -841,7 +841,7 @@ void LayoutBox::SetLocationAndUpdateOverflowControlsIfNeeded(
     SetLocation(location);
     if (PixelSnappedBorderBoxRect().Size() !=
         old_pixel_snapped_border_rect_size) {
-      Layer()->UpdateScrollingAfterLayout();
+      Layer()->UpdateSizeAndScrollingAfterLayout();
     }
     return;
   }