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 881fc63a18c90cfccaaa2c020bb0e1a33395b7f5..188d946d60596715872a0499f770a7bab79cb750 100644
--- a/third_party/WebKit/Source/core/dom/Element.cpp
+++ b/third_party/WebKit/Source/core/dom/Element.cpp
@@ -117,6 +117,7 @@
 #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"
@@ -1638,6 +1639,8 @@ void Element::detachLayoutTree(const AttachContext& context)
     if (svgFilterNeedsLayerUpdate())
         document().unscheduleSVGFilterLayerUpdateHack(*this);
 
+    setNeedsResizeObserverUpdate();
+
     DCHECK(needsAttach());
 }
 
@@ -2693,6 +2696,14 @@ HeapHashMap<Member<ResizeObserver>, Member<ResizeObservation>>& Element::ensureR
     return ensureElementRareData().ensureResizeObserverData();
 }
 
+void Element::setNeedsResizeObserverUpdate()
+{
+    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)
 {