[cc] Change semantics of fixed-pos container layer

cc/trees/layer_tree_host_common_unittest.cc

 // 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.
 
 #include "cc/trees/layer_tree_host_common.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <memory>
@@ skipping 8002 matching lines @@
   // + root
   //   + container
   //    + scroller
   //     + fixed_pos
   //
   scoped_refptr<Layer> root = Layer::Create();
   scoped_refptr<Layer> container = Layer::Create();
   scoped_refptr<Layer> scroller = Layer::Create();
   scoped_refptr<Layer> fixed_pos = Layer::Create();
 
-  scroller->SetIsContainerForFixedPositionLayers(true);
+  container->SetIsContainerForFixedPositionLayers(true);
 
   root->AddChild(container);
   container->AddChild(scroller);
   scroller->AddChild(fixed_pos);
   host()->SetRootLayer(root);
 
   LayerPositionConstraint fixed_position;
   fixed_position.set_is_fixed_position(true);
   scroller->SetScrollClipLayerId(container->id());
   fixed_pos->SetPositionConstraint(fixed_position);
@@ skipping 857 matching lines @@
   root->AddChild(inner_viewport_container_layer);
   inner_viewport_container_layer->AddChild(inner_viewport_scroll_layer);
   inner_viewport_scroll_layer->AddChild(outer_viewport_container_layer);
   outer_viewport_container_layer->AddChild(outer_viewport_scroll_layer);
 
   inner_viewport_scroll_layer->SetScrollClipLayerId(
       inner_viewport_container_layer->id());
   outer_viewport_scroll_layer->SetScrollClipLayerId(
       outer_viewport_container_layer->id());
 
-  inner_viewport_scroll_layer->SetIsContainerForFixedPositionLayers(true);
-  outer_viewport_scroll_layer->SetIsContainerForFixedPositionLayers(true);
+  inner_viewport_container_layer->SetIsContainerForFixedPositionLayers(true);
+  outer_viewport_container_layer->SetIsContainerForFixedPositionLayers(true);
 
   host()->SetRootLayer(root);
   host()->RegisterViewportLayers(nullptr, root, inner_viewport_scroll_layer,
                                  outer_viewport_scroll_layer);
 
   scoped_refptr<Layer> fixed_to_inner = Layer::Create();
   scoped_refptr<Layer> fixed_to_outer = Layer::Create();
 
   inner_viewport_scroll_layer->AddChild(fixed_to_inner);
   outer_viewport_scroll_layer->AddChild(fixed_to_outer);
@@ skipping 1961 matching lines @@
 
   // Check child layer draw properties.
   EXPECT_EQ(gfx::Rect(10, 10), child->visible_layer_rect());
   EXPECT_EQ(gfx::Transform(), child->DrawTransform());
   EXPECT_EQ(gfx::Rect(10, 10), child->clip_rect());
   EXPECT_EQ(gfx::Rect(10, 10), child->drawable_content_rect());
 }
 
 }  // namespace
 }  // namespace cc