Initial ResizeObserver implementation

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

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index 19a7397d298bd7b923351fb71db08556e8292987..9d28232748bcc2309d7b4591c6c8c4a7fd383951 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -187,6 +187,7 @@
 #include "core/loader/ImageLoader.h"
 #include "core/loader/NavigationScheduler.h"
 #include "core/loader/appcache/ApplicationCacheHost.h"
+#include "core/observer/ResizeObserverController.h"
 #include "core/page/ChromeClient.h"
 #include "core/page/EventWithHitTestResults.h"
 #include "core/page/FocusController.h"
@@ -5189,6 +5190,13 @@ NodeIntersectionObserverData& Document::ensureIntersectionObserverData()
     return *m_intersectionObserverData;
 }
 
+ResizeObserverController& Document::ensureResizeObserverController()
+{
+    if (!m_resizeObserverController)
+        m_resizeObserverController = new ResizeObserverController();
+    return *m_resizeObserverController;
+}
+
 void Document::reportBlockedScriptExecutionToInspector(const String& directiveText)
 {
     InspectorInstrumentation::scriptExecutionBlockedByCSP(this, directiveText);
@@ -5982,6 +5990,7 @@ DEFINE_TRACE(Document)
     visitor->trace(m_intersectionObserverController);
     visitor->trace(m_intersectionObserverData);
     visitor->trace(m_snapCoordinator);
+    visitor->trace(m_resizeObserverController);
     Supplementable<Document>::trace(visitor);
     TreeScope::trace(visitor);
     ContainerNode::trace(visitor);