Separate the geometry update from rebuilding the GraphicsLayer tree

Source/core/rendering/compositing/RenderLayerCompositor.h

Index: Source/core/rendering/compositing/RenderLayerCompositor.h
diff --git a/Source/core/rendering/compositing/RenderLayerCompositor.h b/Source/core/rendering/compositing/RenderLayerCompositor.h
index e17c707a74b38e9c912b009b320a90a2b4f5bc14..f399d468752cd9c4b9d55579293cccf11e75ae9a 100644
--- a/Source/core/rendering/compositing/RenderLayerCompositor.h
+++ b/Source/core/rendering/compositing/RenderLayerCompositor.h
@@ -190,6 +190,9 @@ public:
 
     void scheduleAnimationIfNeeded();
 
+    // Whether the layer could ever be composited.
+    bool canBeComposited(const RenderLayer*) const;
+
 private:
     class OverlapMap;
 
@@ -238,16 +241,11 @@ private:
 
     // Whether the given RL needs to paint into its own separate backing (and hence would need its own CompositedLayerMapping).
     bool needsOwnBacking(const RenderLayer*) const;
-    // Whether the layer could ever be composited.
-    bool canBeComposited(const RenderLayer*) const;
 
     void updateDirectCompositingReasons(RenderLayer*);
 
     void updateIfNeeded();
 
-    // Returns indirect reasons that a layer should be composited because of something in its subtree.
-    CompositingReasons subtreeReasonsForCompositing(RenderObject*, bool hasCompositedDescendants, bool has3DTransformedDescendants) const;
-
     // Make or destroy the CompositedLayerMapping for this layer; returns true if the compositedLayerMapping changed.
     bool allocateOrClearCompositedLayerMapping(RenderLayer*, CompositingStateTransitionType compositedLayerUpdate);
     bool updateSquashingAssignment(RenderLayer*, SquashingState&, CompositingStateTransitionType compositedLayerUpdate);
@@ -264,8 +262,6 @@ private:
     void setCompositingParent(RenderLayer* childLayer, RenderLayer* parentLayer);
     void removeCompositedChildren(RenderLayer*);
 
-    bool isRunningAcceleratedTransformAnimation(RenderObject*) const;
-
     bool hasAnyAdditionalCompositedLayers(const RenderLayer* rootLayer) const;
 
     void ensureRootLayer();
@@ -345,7 +341,6 @@ private:
 #endif
 };
 
-
 } // namespace WebCore
 
 #endif // RenderLayerCompositor_h