Support bottom-right anchored fixed-position elements during a pinch gesture

webkit/compositor_bindings/web_layer_impl.h

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WEBKIT_COMPOSITOR_BINDINGS_WEB_LAYER_IMPL_H_
 #define WEBKIT_COMPOSITOR_BINDINGS_WEB_LAYER_IMPL_H_
 
 #include "base/memory/ref_counted.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebAnimation.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebColor.h"
@@ skipping 92 matching lines @@
   virtual void setShouldScrollOnMainThread(bool scroll_on_main);
   virtual bool shouldScrollOnMainThread() const;
   virtual void setNonFastScrollableRegion(
       const WebKit::WebVector<WebKit::WebRect>& region);
   virtual WebKit::WebVector<WebKit::WebRect> nonFastScrollableRegion() const;
   virtual void setTouchEventHandlerRegion(
       const WebKit::WebVector<WebKit::WebRect>& region);
   virtual WebKit::WebVector<WebKit::WebRect> touchEventHandlerRegion() const;
   virtual void setIsContainerForFixedPositionLayers(bool is_container);
   virtual bool isContainerForFixedPositionLayers() const;
-  virtual void setFixedToContainerLayer(bool is_fixed);
-  virtual bool fixedToContainerLayer() const;
+  virtual void setPositionConstraint(
+      const WebKit::WebLayerPositionConstraint& constraint);
+  virtual WebKit::WebLayerPositionConstraint positionConstraint() const;
   virtual void setScrollClient(WebKit::WebLayerScrollClient* client);
   virtual bool isOrphan() const;
 
  protected:
   scoped_refptr<cc::Layer> layer_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WebLayerImpl);
 };
 
 }  // namespace WebKit
 
 #endif  // WEBKIT_COMPOSITOR_BINDINGS_WEB_LAYER_IMPL_H_