ResizeObserver: Olipan C++ tests

third_party/WebKit/Source/core/observer/ResizeObserverController.h

 // 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.
 
 #ifndef ResizeObserverController_h
 #define ResizeObserverController_h
 
 #include "platform/heap/Handle.h"
 
 namespace blink {
@@ skipping 20 matching lines @@
     size_t gatherObservations(size_t deeperThan);
     // Returns true if gatherObservations has skipped observations
     // because they were too shallow.
     bool skippedObservations();
     void deliverObservations();
     void clearObservations();
     void observerChanged()  { m_observersChanged = true; }
 
     DECLARE_TRACE();
 
+    // For testing only.
+    const HeapHashSet<WeakMember<ResizeObserver>>& observers() { return m_observers; }
+
 private:
     // Active observers
     HeapHashSet<WeakMember<ResizeObserver>> m_observers;
     // True if any observers were changed since last notification.
     bool m_observersChanged;
 };
 
 } // namespace blink
 
 #endif