ResizeObserver pt6: integration

third_party/WebKit/Source/core/dom/Element.cpp

Index: third_party/WebKit/Source/core/dom/Element.cpp
diff --git a/third_party/WebKit/Source/core/dom/Element.cpp b/third_party/WebKit/Source/core/dom/Element.cpp
index 9cce24f6a0f58afd4ba5c6ec0704733e4ab0c8db..4d44a2acef7ff89f183d502581ed23fa55e4acff 100644
--- a/third_party/WebKit/Source/core/dom/Element.cpp
+++ b/third_party/WebKit/Source/core/dom/Element.cpp
@@ -116,6 +116,7 @@
 #include "core/layout/api/LayoutBoxItem.h"
 #include "core/layout/api/LayoutViewItem.h"
 #include "core/loader/DocumentLoader.h"
+#include "core/observer/ResizeObservation.h"
 #include "core/page/ChromeClient.h"
 #include "core/page/FocusController.h"
 #include "core/page/Page.h"
@@ -1623,6 +1624,8 @@ void Element::detachLayoutTree(const AttachContext& context)
     if (svgFilterNeedsLayerUpdate())
         document().unscheduleSVGFilterLayerUpdateHack(*this);
 
+    sizeMayHaveChanged();
+
     DCHECK(needsAttach());
 }
 
@@ -2689,6 +2692,14 @@ HeapHashMap<Member<ResizeObserver>, Member<ResizeObservation>>& Element::ensureR
     return ensureElementRareData().ensureResizeObserverData();
 }
 
+void Element::sizeMayHaveChanged()
+{
+    if (auto* data = resizeObserverData()) {
+        for (auto& observation : data->values())
+            observation->elementSizeChanged();
+    }
+}
+
 // Step 1 of http://domparsing.spec.whatwg.org/#insertadjacenthtml()
 static Element* contextElementForInsertion(const String& where, Element* element, ExceptionState& exceptionState)
 {