ResizeObserver pt4: IDL methods

third_party/WebKit/Source/core/observer/ResizeObserver.cpp

Index: third_party/WebKit/Source/core/observer/ResizeObserver.cpp
diff --git a/third_party/WebKit/Source/core/observer/ResizeObserver.cpp b/third_party/WebKit/Source/core/observer/ResizeObserver.cpp
index 838daca88bc1dc6dca768dfbe4563b65c6920753..f285e0d3e4147e6f762f7e06f56271d36e5afa32 100644
--- a/third_party/WebKit/Source/core/observer/ResizeObserver.cpp
+++ b/third_party/WebKit/Source/core/observer/ResizeObserver.cpp
@@ -5,9 +5,11 @@
 #include "core/observer/ResizeObserver.h"
 
 #include "core/dom/Element.h"
+#include "core/frame/FrameView.h"
 #include "core/observer/ResizeObservation.h"
 #include "core/observer/ResizeObserverCallback.h"
 #include "core/observer/ResizeObserverController.h"
+#include "core/observer/ResizeObserverEntry.h"
 
 namespace blink {
 
@@ -25,14 +27,40 @@ ResizeObserver::ResizeObserver(ResizeObserverCallback* callback, Document& docum
 
 void ResizeObserver::observe(Element* target)
 {
+    auto& observerMap = target->ensureResizeObserverData();
+    if (observerMap.contains(this))
+        return; // Already registered.
+
+    auto observation = new ResizeObservation(target, this);
+    m_observations.add(observation);
+    observerMap.set(this, observation);
+
+    if (FrameView* frameView = target->document().view())
+        frameView->scheduleAnimation();
 }
 
 void ResizeObserver::unobserve(Element* target)
 {
+    auto observerMap = target ? target->resizeObserverData() : nullptr;
+    if (!observerMap)
+        return;
+    auto observation = observerMap->find(this);
+    if (observation != observerMap->end()) {
+        m_observations.remove((*observation).value);
+        observerMap->remove(observation);
+    }
 }
 
 void ResizeObserver::disconnect()
 {
+    ObservationList observations;
+    m_observations.swap(observations);
+
+    for (auto observation : observations) {
+        Element* target = (*observation).target();
+        if (target)
+            target->ensureResizeObserverData().remove(this);
+    }
 }
 
 DEFINE_TRACE(ResizeObserver)