ResizeObserver implementation, part 2: lifetime

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

Index: third_party/WebKit/Source/core/observer/ResizeObservation.cpp
diff --git a/third_party/WebKit/Source/core/observer/ResizeObservation.cpp b/third_party/WebKit/Source/core/observer/ResizeObservation.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..c779d30a41626ec57ac94772b7b96e512bbb671e
--- /dev/null
+++ b/third_party/WebKit/Source/core/observer/ResizeObservation.cpp
@@ -0,0 +1,27 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "core/observer/ResizeObservation.h"
+
+#include "core/dom/Element.h"
+#include "core/observer/ResizeObserver.h"
+
+namespace blink {
+
+ResizeObservation::ResizeObservation(Element* target, ResizeObserver* observer)
+    : m_target(target)
+    , m_observer(observer)
+{
+    DCHECK(m_target);
+    m_target->ensureResizeObserverData().set(observer, this);

[esprehn, 2016/07/21 17:52:28]

Can the caller do this instead? See IntersectionObserver

[atotic1, 2016/07/21 19:15:00]

Done. Impressed you've caught this one. 

As I was working my way through the CR train, I've noticed this too,
it was already there in the next CR.

+}
+
+DEFINE_TRACE(ResizeObservation)
+{
+    visitor->trace(m_target);
+    visitor->trace(m_observer);
+}
+
+
+} // namespace blink