Implement position: sticky updates on compositor

third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp

 /*
  * Copyright (C) 2009 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    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
@@ skipping 1134 matching lines @@
 void GraphicsLayer::setFilters(CompositorFilterOperations filters)
 {
     platformLayer()->setFilters(filters.releaseCcFilterOperations());
 }
 
 void GraphicsLayer::setBackdropFilters(CompositorFilterOperations filters)
 {
     platformLayer()->setBackgroundFilters(filters.releaseCcFilterOperations());
 }
 
+void GraphicsLayer::setStickyPositionConstraint(const WebLayerStickyPositionConstraint& stickyConstraint)
+{
+    m_layer->layer()->setStickyPositionConstraint(stickyConstraint);
+}
+
 void GraphicsLayer::setFilterQuality(SkFilterQuality filterQuality)
 {
     if (m_imageLayer)
         m_imageLayer->setNearestNeighbor(filterQuality == kNone_SkFilterQuality);
 }
 
 void GraphicsLayer::setPaintingPhase(GraphicsLayerPaintingPhase phase)
 {
     if (m_paintingPhase == phase)
         return;
@@ skipping 181 matching lines @@
 {
     if (!layer) {
         fprintf(stderr, "Cannot showGraphicsLayerTree for (nil).\n");
         return;
     }
 
     String output = layer->layerTreeAsText(blink::LayerTreeIncludesDebugInfo);
     fprintf(stderr, "%s\n", output.utf8().data());
 }
 #endif