ResizeObserver pt6: integration

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 b2de1e362e42e9f920416ac90784ba2b85107034..ed8fbdf554cf772335cb0ce3606ee482438e9846 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBox.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
@@ -1562,6 +1562,18 @@ ResourcePriority LayoutBox::computeResourcePriority() const
     return ResourcePriority(isVisible ? ResourcePriority::Visible : ResourcePriority::NotVisible, screenArea);
 }
 
+void LayoutBox::frameRectChanged()
+{
+    if (node() && node()->isElementNode()) {
+        Element& element = toElement(*node());
+        element.setNeedsResizeObserverUpdate();
+    }
+    // The frame rect may change because of layout of other objects.
+    // Should check this object for paint invalidation.
+    if (!needsLayout())
+        setMayNeedPaintInvalidation();
+}
+
 bool LayoutBox::intersectsVisibleViewport() const
 {
     LayoutRect rect = visualOverflowRect();