Remove scroll_clip_layer dependency from viewport layer tracking

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

 /*
  * Copyright (C) 2012 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:
  * 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 51 matching lines @@
     clip_layer_->AddChild(scroll_elasticity_layer_.get());
     scroll_elasticity_layer_->AddChild(graphics_layer_.get());
     graphics_layer_->PlatformLayer()->SetScrollClipLayer(
         clip_layer_->PlatformLayer());
     platform_layer_ = graphics_layer_->PlatformLayer();
     layer_tree_view_ = WTF::WrapUnique(new WebLayerTreeViewImplForTesting);
     DCHECK(layer_tree_view_);
     layer_tree_view_->SetRootLayer(*clip_layer_->PlatformLayer());
     layer_tree_view_->RegisterViewportLayers(
         scroll_elasticity_layer_->PlatformLayer(), clip_layer_->PlatformLayer(),
-        graphics_layer_->PlatformLayer(), 0);
+        clip_layer_->PlatformLayer(), nullptr, graphics_layer_->PlatformLayer(),
+        nullptr);
     layer_tree_view_->SetViewportSize(WebSize(1, 1));
   }
 
   ~GraphicsLayerTest() override {
     graphics_layer_.reset();
     layer_tree_view_.reset();
   }
 
   WebLayerTreeView* LayerTreeView() { return layer_tree_view_.get(); }
 
@@ skipping 113 matching lines @@
     return Platform::Current()->CurrentThread()->Scheduler()->TimerTaskRunner();
   }
 
   DEFINE_INLINE_VIRTUAL_TRACE() { ScrollableArea::Trace(visitor); }
 
  private:
   ScrollOffset scroll_offset_;
 };
 
 }  // namespace blink