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

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

Index: third_party/WebKit/Source/core/frame/FrameView.h
diff --git a/third_party/WebKit/Source/core/frame/FrameView.h b/third_party/WebKit/Source/core/frame/FrameView.h
index 2efbb0f03a99d72a95516ecbb14a4ba7f358b987..59805a5cfa53c1fc4eaea1dd4426e8763f95be0d 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.h
+++ b/third_party/WebKit/Source/core/frame/FrameView.h
@@ -47,6 +47,9 @@
 #include "platform/geometry/LayoutRect.h"
 #include "platform/graphics/Color.h"
 #include "platform/graphics/GraphicsLayerClient.h"
+// TODO(wkorman): See whether we can come up with a forward decl that works for
+// CompositorElementIdSet.
+#include "platform/graphics/compositing/PaintArtifactCompositor.h"
 #include "platform/scroll/ScrollTypes.h"
 #include "platform/scroll/Scrollbar.h"
 #include "public/platform/ShapeProperties.h"
@@ -927,7 +930,8 @@ class CORE_EXPORT FrameView final
 
   // TODO(wangxianzhu): Remove the parameter and use m_paintController for SPv2.
   void notifyPaint(const PaintController&) const;
-  void pushPaintArtifactToCompositor();
+  void pushPaintArtifactToCompositor(
+      CompositorElementIdSet& compositedAnimationElementIds);
 
   void reset();
   void init();