[SPv2] Decomposite otherwise-compositable animations that paint nothing.

third_party/WebKit/Source/core/frame/FrameView.h

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights
    reserved.
 
    This library is free software; you can redistribute it and/or
@@ skipping 28 matching lines @@
 #include "core/paint/PaintInvalidationCapableScrollableArea.h"
 #include "core/paint/PaintPhase.h"
 #include "core/paint/ScrollbarManager.h"
 #include "platform/FrameViewBase.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/animation/CompositorAnimationHost.h"
 #include "platform/animation/CompositorAnimationTimeline.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/geometry/LayoutRect.h"
 #include "platform/graphics/Color.h"
+#include "platform/graphics/CompositorElementId.h"
 #include "platform/graphics/GraphicsLayerClient.h"
 #include "platform/scroll/ScrollTypes.h"
 #include "platform/scroll/Scrollbar.h"
 #include "public/platform/ShapeProperties.h"
 #include "public/platform/WebDisplayMode.h"
 #include "public/platform/WebRect.h"
 #include "wtf/Allocator.h"
 #include "wtf/AutoReset.h"
 #include "wtf/Forward.h"
 #include "wtf/HashSet.h"
 #include "wtf/ListHashSet.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class AXObjectCache;
 class ComputedStyle;
+class Cursor;
 class DocumentLifecycle;
-class Cursor;
 class Element;
 class ElementVisibilityObserver;
 class Frame;
 class FloatSize;
 class GeometryMapper;
 class JSONArray;
 class JSONObject;
 class LayoutItem;
 class LayoutViewItem;
 class LayoutPart;
@@ skipping 842 matching lines @@
   void updateStyleAndLayoutIfNeededRecursive();
   void prePaint();
   void paintTree();
   void paintGraphicsLayerRecursively(GraphicsLayer*);
 
   void updateStyleAndLayoutIfNeededRecursiveInternal();
   void invalidateTreeIfNeededRecursiveInternal();
 
   // TODO(wangxianzhu): Remove the parameter and use m_paintController for SPv2.
   void notifyPaint(const PaintController&) const;
-  void pushPaintArtifactToCompositor();
+  void pushPaintArtifactToCompositor(
+      CompositorElementIdSet& compositedElementIds);
 
   void reset();
   void init();
 
   void clearLayoutSubtreeRootsAndMarkContainingBlocks();
 
   // Called when our frame rect changes (or the rect/scroll offset of an
   // ancestor changes).
   void frameRectsChanged() override;
 
@@ skipping 325 matching lines @@
                   frameViewBase.isFrameView());
 DEFINE_TYPE_CASTS(FrameView,
                   ScrollableArea,
                   scrollableArea,
                   scrollableArea->isFrameView(),
                   scrollableArea.isFrameView());
 
 }  // namespace blink
 
 #endif  // FrameView_h