Initial ResizeObserver implementation

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..57e8f9c99f460b409edc1c039df25316093eb576
--- /dev/null
+++ b/third_party/WebKit/Source/core/observer/ResizeObservation.cpp
@@ -0,0 +1,55 @@
+// 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/observer/ResizeObserver.h"
+
+namespace blink {
+
+ResizeObservation::ResizeObservation(Element * target, ResizeObserver * observer) :

[szager1, 2016/05/23 19:49:10]

Colon goes on next line; refer to existing class declarations.

[atotic1, 2016/05/25 00:15:52]

Done.

+    m_target(target),

[szager1, 2016/05/23 19:49:10]

Comma goes at the beginning of the next line, for all constructors.

[atotic1, 2016/05/25 00:15:52]

Done.

+    m_observer(observer),
+    m_broadcastWidth(target->clientWidth()),
+    m_broadcastHeight(target->clientHeight())
+{
+    m_target->ensureResizeObserverData().add(this);
+}
+
+bool ResizeObservation::hasResized() const
+{
+    if (!m_target)
+        return false;
+    return (m_target->clientWidth() != m_broadcastWidth
+        || m_target->clientHeight() != m_broadcastHeight);
+}
+
+void ResizeObservation::setBroadcastSize(int width, int height)
+{
+    m_broadcastWidth = width;
+    m_broadcastHeight = height;
+}
+
+DEFINE_TRACE(ResizeObservation)
+{
+    visitor->trace(m_target);
+    visitor->trace(m_observer);
+}
+
+void ResizeObservationSet::add(ResizeObservation* obs)
+{
+    m_observations.add(obs);
+}
+
+void ResizeObservationSet::remove(ResizeObservation* obs)
+{
+    m_observations.remove(obs);
+}
+
+DEFINE_TRACE(ResizeObservationSet)
+{
+    visitor->trace(m_observations);
+}
+
+} // namespace blink