Initial ResizeObserver implementation

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

Index: third_party/WebKit/Source/core/observer/ResizeObserverEntry.cpp
diff --git a/third_party/WebKit/Source/platform/text/linux/HyphenationLinux.cpp b/third_party/WebKit/Source/core/observer/ResizeObserverEntry.cpp
similarity index 55%
copy from third_party/WebKit/Source/platform/text/linux/HyphenationLinux.cpp
copy to third_party/WebKit/Source/core/observer/ResizeObserverEntry.cpp
index ca2b39fe6cce5b64bfbea81e4f691d92e2a85acc..ad2fe7a3d86e8115bb618eeb8b4a0ca42737b1d8 100644
--- a/third_party/WebKit/Source/platform/text/linux/HyphenationLinux.cpp
+++ b/third_party/WebKit/Source/core/observer/ResizeObserverEntry.cpp
@@ -2,13 +2,18 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "platform/text/Hyphenation.h"
+#include "core/observer/ResizeObserverEntry.h"
+
+#include "core/dom/Element.h"
 
 namespace blink {
 
-PassRefPtr<Hyphenation> Hyphenation::platformGetHyphenation(const AtomicString&)
+class ResizeObservation;
+
+
+DEFINE_TRACE(ResizeObserverEntry)
 {
-    return nullptr;
+    visitor->trace(m_target);
 }
 
 } // namespace blink