Suppress layer creation for descendants of GPU-rasterized layers

Source/core/rendering/compositing/CompositingReasonFinder.h

Index: Source/core/rendering/compositing/CompositingReasonFinder.h
diff --git a/Source/core/rendering/compositing/CompositingReasonFinder.h b/Source/core/rendering/compositing/CompositingReasonFinder.h
index bb1a38ad297aa93eb34690301ae698e84617a446..762cd2c1abaa3cc6daa8f55d0fdd22391c14b5e4 100644
--- a/Source/core/rendering/compositing/CompositingReasonFinder.h
+++ b/Source/core/rendering/compositing/CompositingReasonFinder.h
@@ -20,7 +20,7 @@ class CompositingReasonFinder {
 public:
     explicit CompositingReasonFinder(RenderView&);
 
-    CompositingReasons styleDeterminedReasons(RenderObject*) const;
+    CompositingReasons styleDeterminedReasons(const RenderLayer*) const;
     CompositingReasons directReasons(const RenderLayer*, bool* needToRecomputeCompositingRequirements) const;
 
     void updateTriggers();
@@ -41,6 +41,8 @@ private:
 
     CompositingReasons nonStyleDeterminedDirectReasons(const RenderLayer*, bool* needToRecomputeCompositingRequirements) const;
 
+    CompositingReasons suppressStyleDeterminedReasonsIfPossible(const RenderLayer*, CompositingReasons styleReasons) const;
+
     bool requiresCompositingForAnimation(RenderObject*) const;
     bool requiresCompositingForTransform(RenderObject*) const;
     bool requiresCompositingForBackfaceVisibilityHidden(RenderObject*) const;
@@ -50,7 +52,8 @@ private:
     bool requiresCompositingForOverflowScrolling(const RenderLayer*) const;
     bool requiresCompositingForPositionSticky(RenderObject*, const RenderLayer*) const;
     bool requiresCompositingForPositionFixed(RenderObject*, const RenderLayer*, RenderLayer::ViewportConstrainedNotCompositedReason*, bool* needToRecomputeCompositingRequirements) const;
-    bool requiresCompositingForWillChange(const RenderObject*) const;
+    bool requiresCompositingForWillChangeCompositingHint(const RenderObject*) const;
+    bool requiresCompositingForWillChangeGpuRasterizationHint(const RenderObject*) const;
 
     RenderView& m_renderView;
     CompositingTriggerFlags m_compositingTriggers;