Handle nested position:sticky elements correctly (compositor)

third_party/WebKit/public/platform/WebLayer.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
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  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
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  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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 #ifndef WebLayer_h
 #define WebLayer_h
 
+#include "cc/layers/layer.h"
+
 #include "WebBlendMode.h"
 #include "WebColor.h"
 #include "WebCommon.h"
 #include "WebFloatPoint.h"
 #include "WebFloatPoint3D.h"
 #include "WebFloatSize.h"
 #include "WebPoint.h"
 #include "WebRect.h"
 #include "WebSize.h"
 #include "WebString.h"
@@ skipping 12 matching lines @@
 
 class WebLayerScrollClient;
 struct WebFloatPoint;
 struct WebLayerPositionConstraint;
 struct WebLayerStickyPositionConstraint;
 
 class WebLayer {
  public:
   virtual ~WebLayer() {}
 
+  static constexpr int kInvalidLayerId = cc::Layer::INVALID_ID;
+
   // Returns a positive ID that will be unique across all WebLayers allocated in
   // this process.
   virtual int id() const = 0;
 
   // Sets a region of the layer as invalid, i.e. needs to update its content.
   virtual void invalidateRect(const WebRect&) = 0;
 
   // Sets the entire layer as invalid, i.e. needs to update its content.
   virtual void invalidate() = 0;
 
@@ skipping 145 matching lines @@
 
   virtual void setCompositorMutableProperties(uint32_t) = 0;
   virtual uint32_t compositorMutableProperties() const = 0;
 
   virtual void setHasWillChangeTransformHint(bool) = 0;
 };
 
 }  // namespace blink
 
 #endif  // WebLayer_h