cc : Push layer lists instead of layer tree at commit and activation

cc/tiles/tile_manager_unittest.cc

 // Copyright 2013 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 <stddef.h>
 #include <stdint.h>
 
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 766 matching lines @@
 
   host_impl()->SetViewportSize(layer_bounds);
 
   scoped_refptr<FakeRasterSource> pending_raster_source =
       FakeRasterSource::CreateFilled(layer_bounds);
   SetupPendingTree(pending_raster_source);
 
   std::unique_ptr<FakePictureLayerImpl> pending_child =
       FakePictureLayerImpl::CreateWithRasterSource(host_impl()->pending_tree(),
                                                    2, pending_raster_source);
+  int child_id = pending_child->id();
   pending_layer()->AddChild(std::move(pending_child));
 
   FakePictureLayerImpl* pending_child_layer =
       static_cast<FakePictureLayerImpl*>(pending_layer()->children()[0]);
   pending_child_layer->SetDrawsContent(true);
 
   host_impl()->AdvanceToNextFrame(base::TimeDelta::FromMilliseconds(1));
   bool update_lcd_text = false;
   host_impl()->pending_tree()->property_trees()->needs_rebuild = true;
   host_impl()->pending_tree()->BuildLayerListAndPropertyTreesForTesting();
   host_impl()->pending_tree()->UpdateDrawProperties(update_lcd_text);
 
   ActivateTree();
   SetupPendingTree(pending_raster_source);
 
-  FakePictureLayerImpl* active_child_layer =
-      static_cast<FakePictureLayerImpl*>(active_layer()->children()[0]);
+  FakePictureLayerImpl* active_child_layer = static_cast<FakePictureLayerImpl*>(
+      host_impl()->active_tree()->LayerById(child_id));
 
   std::set<Tile*> all_tiles;
   size_t tile_count = 0;
   std::unique_ptr<RasterTilePriorityQueue> raster_queue(
       host_impl()->BuildRasterQueue(SAME_PRIORITY_FOR_BOTH_TREES,
                                     RasterTilePriorityQueue::Type::ALL));
   while (!raster_queue->IsEmpty()) {
     ++tile_count;
     EXPECT_TRUE(raster_queue->Top().tile());
     all_tiles.insert(raster_queue->Top().tile());
@@ skipping 1068 matching lines @@
 }
 
 // Ensures that the tile manager does not attempt to reuse tiles when partial
 // raster is disabled.
 TEST_F(TileManagerTest, PartialRasterSuccessfullyDisabled) {
   RunPartialRasterCheck(TakeHostImpl(), false /* partial_raster_enabled */);
 }
 
 }  // namespace
 }  // namespace cc