Initial ResizeObserver implementation

third_party/WebKit/Source/core/dom/Document.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 126 matching lines @@
 class NodeFilter;
 class NodeIntersectionObserverData;
 class NodeIterator;
 class NthIndexCache;
 class OriginAccessEntry;
 class Page;
 class PlatformMouseEvent;
 class ProcessingInstruction;
 class QualifiedName;
 class Range;
+class ResizeObserverController;
 class LayoutView;
 class ResourceFetcher;
 class SVGDocumentExtensions;
 class SVGUseElement;
 class ScriptRunner;
 class ScriptableDocumentParser;
 class ScriptedAnimationController;
 class ScriptedIdleTaskController;
 class SecurityOrigin;
 class SegmentedString;
@@ skipping 525 matching lines @@
     {
         return m_mutationObserverTypes & type;
     }
     bool hasMutationObservers() const { return m_mutationObserverTypes; }
     void addMutationObserverTypes(MutationObserverOptions types) { m_mutationObserverTypes |= types; }
 
     IntersectionObserverController* intersectionObserverController();
     IntersectionObserverController& ensureIntersectionObserverController();
     NodeIntersectionObserverData& ensureIntersectionObserverData();
 
+    bool resizeObserverController() const { return m_resizeObserverController; }

[szager1, 2016/06/02 20:52:41]

I would still prefer that you honor existing convention, like these:

    StyleResolver* styleResolver() const;
    StyleResolver& ensureStyleResolver() const;

    IntersectionObserverController* intersectionObserverController();
    IntersectionObserverController& ensureIntersectionObserverController();

    Document& ensureTemplateDocument();
    Document* templateDocumentHost() { return m_templateDocumentHost; }

    EventTargetData* eventTargetData() override;
    EventTargetData& ensureEventTargetData() override;

    NodeRareData* rareData() const;
    NodeRareData& ensureRareData();

Some background on why we discourage implicit bool conversions from concrete
types:

http://www.artima.com/cppsource/safebool.html

[atotic1, 2016/06/08 18:59:21]

Done.

+    ResizeObserverController& ensureResizeObserverController();
+
     void updateViewportDescription();
     void processReferrerPolicy(const String& policy);
 
     // Returns the owning element in the parent document. Returns nullptr if
     // this is the top level document or the owner is remote.
     HTMLFrameOwnerElement* localOwner() const;
 
     // Returns true if this document belongs to a frame that the parent document
     // made invisible (for instance by setting as style display:none).
     bool isInInvisibleSubframe() const;
@@ skipping 680 matching lines @@
     ParserSynchronizationPolicy m_parserSyncPolicy;
 
     HostsUsingFeatures::Value m_hostsUsingFeaturesValue;
 
     ClientHintsPreferences m_clientHintsPreferences;
 
     Member<CanvasFontCache> m_canvasFontCache;
 
     Member<IntersectionObserverController> m_intersectionObserverController;
     Member<NodeIntersectionObserverData> m_intersectionObserverData;
+    Member<ResizeObserverController> m_resizeObserverController;
 
     int m_nodeCount;
 
     bool m_mayContainV0Shadow = false;
 
     Member<SnapCoordinator> m_snapCoordinator;
 };
 
 extern template class CORE_EXTERN_TEMPLATE_EXPORT Supplement<Document>;
 
@@ skipping 35 matching lines @@
 DEFINE_TYPE_CASTS(TreeScope, Document, document, true, true);
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 CORE_EXPORT void showLiveDocumentInstances();
 #endif
 
 #endif // Document_h